Answers:
The symbiotic relationship that occurs between an orchid and a tree would be classified as commensalism. Most orchids are epiphytes, which mean that that they grow on other plants. This benefits the orchids because they can grow on top of the canopy, which prevents the orchids from being walked on or eaten by ground-dwelling organisms.I HOPE TO IT'S HELP YOU:)If you have a 1234 gram sample of C4H7NO4, how many gams of Carbon would
be present?
Answer: 445.4 grams of carbon would be present.
Explanation:
According to avogadro's law, 1 mole of every substance contains avogadro's number \(6.023\times 10^{23}\) of particles and weighs equal to its molecular mass.
To calculate the moles, we use the equation:
\(\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{1234g}{133g/mol}=9.28moles\)
As 1 mole of \(C_4H_7NO_4\) gives = 4 moles of carbon
Thus 9.28 moles of \(C_4H_7NO_4\) gives = \(\frac{4}{1}\times 9.28=37.1\) moles of carbon
Mass of carbon = \(moles\times {\text {Molar mass}}=37.1moles\times 12g/mol=445.4g\)
Thus there are 445.4 grams of carbon would be present.
A compound has the following composition by mass:
32% carbon, 6.7% hydrogen, 42.6% oxygen and 18.7% nitrogen
What is the empirical formula of the compound?
Answer:
i cry when im alone
Explanation:
what are the harmful effects of water pollution
Answer:
- Reduced biodiversity
- Health problems from drinking the water
- Diseases
There are various types of pollution like air pollution, water pollution , noise pollution etc. Therefore, in below given ways we can see harmful effects of water pollution.
What is pollution?The introduction of hazardous elements into the environment is pollution. Pollutants are the name for these dangerous substances. They can also be brought by by human activities, such as factory runoff or waste.
Following are a few harmful outcomes of water pollution: The health and existence of humans, animals, and plants are all negatively impacted by water pollution. Because it harms crops and soil fertility, polluted water is also bad for agriculture. Ocean life suffers as a result of ocean water pollution.
Therefore, in above ways we can see harmful effects of water pollution.
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Which equation represents a double replacement reaction? A) 2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g) B) 2Al(s) + 3Cl2(g) - 2AlCl3(s) C) 2AlCl3(s) + 2Al(s) + 3Cl2(g) D) AlCl3(aq) + 3KOH(aq) - Al(OH)3(s) + 3KCl(aq)
Answer:
D) AlCl₃(aq) + 3 KOH(aq) → Al(OH)₃(s) + 3 KCl(aq)
Explanation:
Which equation represents a double replacement reaction?
A) 2 Al(s) + 6 HCl(aq) → 2 AlCl₃(aq) + 3 H₂(g)
No, this is a single replacement reaction, in which Al replaces H in its acid.
B) 2 Al(s) + 3 Cl₂(g) → 2 AlCl₃(s)
No, this is a synthesis reaction, in which two simple substances combine to form a compound.
C) 2 AlCl₃(s) → 2 Al(s) + 3 Cl₂(g)
No, this is a decomposition reaction, in which a compound decomposes into simple substances.
D) AlCl₃(aq) + 3 KOH(aq) → Al(OH)₃(s) + 3 KCl(aq)
Yes, this is a double replacement reaction, in which both reactants exchange their cations and anions.
Nitrogen (N2) gas and hydrogen (H2) gas react to form ammonia (NH3) gas. Suppose you have 11 mol of N2 and 9 mol of H2 in a reactor.
Calculate the largest amount of NH3 that could be produced. Round your answer to the nearest 0.1 mol.
In the given reaction, the limiting reactant is hydrogen gas. 3 moles of hydrogen gas produces 2 moles of ammonia, thus 9 moles will produce 6 moles of ammonia that is equal to 102 g.
What is ammonia?Ammonia is an inorganic gas formed by the combination of nitrogen gas and hydrogen gas. The balanced chemical equation for the reaction is written below:
\(\rm N _{2} + 3 H_{2} \rightarrow 2 NH_{3}\)
As per the given reaction, hydrogen gas is needed more in this reaction, and it is the limiting reactant which determines the product yield. Here, 3 moles of hydrogen gas produces 2 moles of ammonia. Thus, 9 moles of hydrogen gas produces:
(9 × 2) / 3 = 6 moles.
Molar mass of ammonia = 17 g/mol
Thus mass of 6 moles = 17 g/mol × 6 moles = 102 g.
Therefore, the largest amount of ammonia that can be produced from 9 moles of hydrogen gas is 102 g.
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a student has a 1 L solution of 2 M HCL and wants to increase the HCL concentration to 3 M
The student needs to add approximately 83.3 mL of 12 M HCl solution to the existing 1 L of 2 M HCl solution to increase the concentration to 3 M. It is important to handle concentrated acids with caution and follow proper safety procedures.
To increase the concentration of a 1 L solution of 2 M HCl to 3 M, the student needs to calculate the volume of concentrated HCl needed and add it to the existing solution. Here's how the calculation can be done:
Given:
Initial concentration of HCl solution = 2 M
Final concentration desired = 3 M
Initial volume of HCl solution = 1 L
Step 1: Calculate the moles of HCl in the initial solution.
Moles of HCl = Initial concentration × Initial volume = 2 M × 1 L = 2 moles
Step 2: Calculate the moles of HCl needed for the desired concentration.
Moles of HCl needed = Final concentration × Final volume = 3 M × 1 L = 3 moles
Step 3: Calculate the moles of HCl to be added.
Moles of HCl to be added = Moles needed - Moles present = 3 moles - 2 moles = 1 mole
Step 4: Convert the moles of HCl to the required volume of concentrated HCl.
To calculate the volume, we need to know the concentration of the concentrated HCl solution. Assuming it is 12 M, we can use the following formula:
Volume of concentrated HCl = Moles of HCl to be added / Concentration of concentrated HCl
Volume of concentrated HCl = 1 mole / 12 M = 0.0833 L or 83.3 mL
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All of the following are factors that affect the rate of a reaction except _____ A) the concentration of the reactants. B) presence of a catalyst. C) the magnitude of the equilibrium constant. D) the temperature of the reaction. E) the surface area of the solid reactants.
The rate of a reaction is not affected by C) the magnitude of the equilibrium constant.
What is the rate of a reaction?The rate of a reaction is the speed at which a chemical reaction takes place, defined as proportional to the increase in the concentration of a product per unit time and to the decrease in the concentration of a reactant per unit time.
Let's consider which of the following factors affect the rate of a reaction.
A) the concentration of the reactants. YES. The relationship between the concentrations of the reactants and the reaction rate depends on the reaction orders.B) presence of a catalyst. YES. Positive catalysts increase the reaction rate whereas negative catalysts decrease it.C) the magnitude of the equilibrium constant. NO. The equilibrium constant does not affect the reaction rate.D) the temperature of the reaction. YES. Usually, the higher the temperature, the faster the reaction.E) the surface area of the solid reactants. YES. The more surface area exposed to react, the faster the reaction.The rate of a reaction is not affected by C) the magnitude of the equilibrium constant.
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What is the correct order for the first three steps of the scientific method?
A. State the question, conduct an experiment, form a hypothesis
B. Form a hypothesis, form a conclusion, conduct an experiment
C. Conduct an experiment, form a hypothesis, analyze the data
D. State the question, form a hypothesis, conduct an experiment
SUBMIT
Answer:
D.) State the question, form a hypothesis, conduct an experiment
Explanation:
https://www.colorincolorado.org/article/steps-scientific-process
In which type of reaction does a reactant compound break down in order to form
two or more compounds or elements in the product?
a. Synthesis
b. Decomposition
c. Combustion
d. Single Displacement
Answer:
decomposition is the answer it helped also explanation of it is below this answer
Explanation:
In a decomposition reaction, one reactant breaks down into two or more products. This is the reverse of a synthesis reaction. Replacement reactions occur when elements switch places in compounds
calculate the volume of hydrogen in the reaction of 73 grams of zinc and 73 grams of hydrochloric acid (under normal conditions) please help
The volume of hydrogen gas produced in the reaction of 73 grams of zinc and 73 grams of hydrochloric acid (under normal conditions) is approximately 22.4 liters.
To calculate the volume of hydrogen gas produced in the reaction of zinc and hydrochloric acid, we need to use the principles of stoichiometry and the ideal gas law.
First, let's write the balanced chemical equation for the reaction between zinc (Zn) and hydrochloric acid (HCl):
Zn + 2HCl →\(ZnCl_2\)+ H2
From the equation, we can see that one mole of zinc reacts with two moles of hydrochloric acid to produce one mole of hydrogen gas. To determine the number of moles of zinc and hydrochloric acid, we need to convert the given masses into moles.
The molar mass of zinc (Zn) is approximately 65.38 g/mol, so 73 grams of zinc is equal to:
73 g Zn * (1 mol Zn / 65.38 g Zn) ≈ 1.116 mol Zn
Similarly, the molar mass of hydrochloric acid (HCl) is approximately 36.46 g/mol, so 73 grams of HCl is equal to:
73 g HCl * (1 mol HCl / 36.46 g HCl) ≈ 2.002 mol HCl
According to the balanced equation, the reaction produces one mole of hydrogen gas for every two moles of hydrochloric acid. Therefore, since we have 2.002 moles of HCl, we expect to produce half that amount, or approximately 1.001 moles of hydrogen gas.
To calculate the volume of hydrogen gas, we can use the ideal gas law, which states:
PV = nRT
Where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. In this case, we assume the reaction is conducted under normal conditions, which means a pressure of 1 atmosphere and a temperature of 273.15 Kelvin.
Rearranging the equation to solve for V, we have:
V = nRT / P
Substituting the values, we get:
V = (1.001 mol) * (0.0821 L·atm/(mol·K)) * (273.15 K) / (1 atm) ≈ 22.4 L
Therefore, the volume of hydrogen gas produced in the reaction is approximately 22.4 liters.
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1. If you place 30.0 L of ethyl acetate (C4H8O2) in a sealed room that is 7.25 m long, 2.75 m wide, and 2.75 m high, will all the ethyl acetate evaporate? If some liquid remains, how much will there be? The vapor pressure of ethyl acetate is 94.9 torr at 25 °C, and the density of the liquid at this temperature is 0.901 g/mL. Treat the room dimensions as exact numbers.
There will be 0.4589 mL of ethyl acetate left in the space after evaporation.
What is evaporation?The conversion of a liquid substance into a gas is known as evaporation. As a result of the liquid absorbing energy from its surroundings, molecules begin to travel faster and faster until they finally become a vapour and escape into the environment. Usually, the energy is absorbed as heat, but it can also be in the form of light or electricity.
No, the ethyl acetate won't all evaporate. The amount of ethyl acetate that will stay in the space after evaporation can be determined using the ideal gas law. As per the ideal gas law, PV = nRT
P is the overall system pressure, V is the room's volume, n is the amount of ethyl acetate in moles, R is the ideal gas constant, and T is the temperature.
To solve for n, the quantity of moles of ethyl acetate, we can rearrange the equation as follows: n = PV/RT
When the values are plugged in, we get:
n = (94.9 torr)(7.25 m x 2.75 m x 2.75 m)/(8.314 J/K mol)(298 K)
\(n = 4.666 \times 10^{-3} mol\)
The molar mass of ethyl acetate (88.11 g/mol) can then be used to compute the mass of ethyl acetate:
Mass = \(n \times M = (4.666 x 10^{-3} mol)(88.11 g/mol)\) = 0.4125 g
Using the density of ethyl acetate (0.901 g/mL), it is possible to determine the volume of the liquid that is still present:
Volume = mass/density = (0.4125 g)/(0.901 g/mL) = 0.4589 mL
As a result, there will be 0.4589 mL of ethyl acetate left in the space after evaporation.
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Is this equation balanced?
Na2SO4 + MgOH -> MgSO4 + NaOH
A) No it’s not balanced. The Na are not balanced.
B) Yes it’s balanced.
C) No it’s not balanced. The Mg atoms are not balanced.
D) No, it’s not balanced. The S atoms are not balanced.
No it’s not balanced. The Na are not balanced (option A)
Why is the given equation not balance?the given chemical equation is not balanced because It is missing some coefficients to balance the number of atoms on both sides of the equation.
The balanced chemical equation for the reaction is:
Na2SO4 + Mg(OH)2 → MgSO4 + 2NaOH
This equation shows that two molecules of sodium hydroxide (NaOH) are produced for every one molecule of magnesium hydroxide (Mg(OH)2) consumed, and that the number of sodium (Na) atoms is balanced on both sides of the equation.
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Which molecule is polar, based on structure?
A. sulfur dioxide
OB. carbon disulphide
OC. ethylene
O D. carbon tetrachloride
Reset
Answer:
Sulfur dioxide (SO2)
⇒ Why is this the best option?
To determine the polarity of the molecule, there are two requirements. The first one has a variety of terminal atoms, whereas the second has a lone pair on the center atoms. The molecule is polar if one of the requirements is met; else, it is nonpolar. The oxygen atom is a terminal atom because it surrounds the sulfur atom, which is the center element in the SO2 molecule's Lewis structure. In this molecule, there are two terminal oxygen atoms. If we look at the first criterion, we can see that it is not met because it calls for the presence of two separate terminal atoms.
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Which of the following BEST describes one of the main functions of proteins?
(b) Washing soda crystals react with acid to give off carbon dioxide.
If you added some washing soda crystals to vinegar,
what would you see happening?
Given: H2 + O 2 → H2O1
the reaction occurs at ST.P a) Balance the chemical equation. (1 pts) b) Calculate the number of moles of the reactants needed to obtain 45 liner of H2O (2 pt) 4) Deduce the volume of the reactants (2 pts)
a) The balanced chemical equation for the reaction is: 2H₂ + O₂ → 2H₂O
b) the number of moles of O₂ required is approximately 1.004 moles.
c) approximately 45 liters of H₂ and 22.5 liters of O₂ are needed to obtain 45 liters of H₂O.
a) Balancing the chemical equation:
The balanced chemical equation for the reaction is: 2H₂ + O₂ → 2H₂O
b) Calculating the number of moles of the reactants needed to obtain 45 liters of H₂O:
From the balanced equation, we can see that for every 2 moles of H₂O produced, we need 2 moles of H₂ and 1 mole of O₂. Since the stoichiometry is based on moles, we need to convert the given volume of H2O into moles.
To convert volume to moles, we need to use the ideal gas law, PV = nRT. At standard temperature and pressure (STP), the molar volume of an ideal gas is 22.4 liters.
Given that we have 45 liters of H2O, we can calculate the number of moles as follows:
moles of H₂O = (volume of H₂O) / (molar volume at STP)
= 45 liters / 22.4 liters/mol
≈ 2.008 moles of H₂O
Since the stoichiometry of the reaction is 2 moles of H₂O for every 2 moles of H₂, we need an equal number of moles of H₂. Therefore, the number of moles of H₂ required is also approximately 2.008 moles.
For O₂, since the stoichiometry is 1 mole of O₂ for every 2 moles of H₂O, we need half the number of moles of H₂O. Thus, the number of moles of O₂required is approximately 1.004 moles.
c) the volume of the reactants:
Since the stoichiometry of the balanced equation is 2 moles of H₂for every 1 mole of O₂ and 2 moles of H₂O, we can deduce the volume of the reactants based on their molar volumes at STP.
For 2.008 moles of H₂, the volume can be calculated as follows:
volume of H₂= (moles of H₂) * (molar volume at STP)
= 2.008 moles * 22.4 liters/mol
≈ 45 liters of H₂
For 1.004 moles of O₂, the volume can be calculated similarly:
volume of O₂= (moles of O₂) * (molar volume at STP)
= 1.004 moles * 22.4 liters/mol
≈ 22.5 liters of O₂
Therefore, approximately 45 liters of H₂and 22.5 liters of O₂ are needed to obtain 45 liters of H₂O
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Which element belongs to the p-block?
O oxygen
O rubidium
O hydrogen
O cobalt
Answer:
Oxygen
Explanation:
Oxygen - p-block (group = 2, period = 16)
Rubidium - s-block (group = 5, period = 1)
Hydrogen - s-block (group = 1, period = 1)
Cobalt - d-block (group = 4, period = 9)
Answer: Oxygen
Explanation:
The qualitative analysis experiment you did is actually an abbreviated version of a much larger analysis scheme in which many different cations are separated and identified. Suppose a mixture contains Ag+, K+, NH4+, Hg22+, Pb2+, Mg2+, Sr2+, Ba2+, Cu2+, Al3+ and Fe3+.
(a) Which of the following ions could you separate, by causing them to precipitate, with the addition of HCl? (Hint: HCl is a source of chloride ions. Select all that apply.)
Ag+ K+ NH4+
Hg22+ Pb2+ Mg2+
Sr2+ Ba2+ Cu2+
Al3+ Fe3+
By inducing them to precipitate, the following ions could be separated by adding HCl:
Ag+, Hg22+, Pb2+
What is HCl?Hydrochloric acid, sometimes known as HCl, is a potent, extremely acidic mixture of hydrogen chloride (HCl) and water. It is a liquid that is colorless, corrosive, and has a strong odor. It is frequently used in industrial and laboratory settings for tasks like metal cleaning, pickling, and pH control.
Ag+, Hg22+, and Pb2+ ions would precipitate from the mixture with the addition of HCl because they produce insoluble chlorides. Hg22+, Pb2+, and Ag+ all produce a white precipitate of AgCl, a yellow precipitation of Hg2Cl2, and a white precipitate of PbCl2. Due to the fact that they either do not create chlorides or their chlorides are soluble in water, the other ions in the combination would not precipitate with the addition of HCl.
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According to the Foliated Metamorphic Rock Chart slate, phyllite, schist, and gneiss can all have the same parent rock (shale). If this is true, what determines the difference between a slate and a gneiss rock that both are formed from shale? What role does the parent rock play in determining the type of metamorphic rock that will be formed?
According to the Foliated Metamorphic Rock Chart slate, phyllite, schist, and gneiss can all have the same parent rock (shale) is a true statement.
The parent rock, in this case shale, plays a significant role in determining the type of metamorphic rock that will be formed. The minerals and structure of the parent rock provide the starting material for the metamorphic rock, and the specific conditions under which the rock undergoes metamorphism determine the final characteristics of the metamorphic rock.What determines the difference between a slate and a gneiss rock that both are formed from shale?Slate, phyllite, schist, and gneiss are all types of metamorphic rocks that can be formed from shale, which is a sedimentary rock composed of clay and other fine-grained minerals. The specific type of metamorphic rock that is formed from shale depends on the conditions under which the shale undergoes metamorphism, including the temperature, pressure, and presence of fluids.
Slate is a fine-grained metamorphic rock with a uniform, flat surface and a layered structure. It is formed when shale undergoes low-grade metamorphism, which occurs at relatively low temperatures and pressures.
Therefore, Gneiss, on the other hand, is a medium- to coarse-grained metamorphic rock with a banded or wavy texture. It is formed when shale undergoes high-grade metamorphism, which occurs at higher temperatures and pressures.
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Can somebody please help me understand this? I don't understand what I need to do to solve any of the parts.
This technique has been used to identify the presence of gases such as oxygen, methane, and carbon dioxide in the atmospheres of exoplanets.
i) To estimate the frequency of the violet (leftmost) emission, we can use the equation v = c/λ, where v is frequency, c is the speed of light (3.00 x 10^8 m/s), and λ is the wavelength of the emission in meters. The wavelength of the violet emission is 400 nm or 400 x 10^-9 m, so the frequency can be calculated as v = (3.00 x 10^8 m/s) / (400 x 10^-9 m) = 7.50 x 10^14 Hz.
ii) To estimate the energy of the violet emission, we can use the equation E = hv, where E is energy, h is Planck's constant (6.63 x 10^-34 Js), and v is frequency in Hz. Substituting the frequency calculated in part (i), we get E = (6.63 x 10^-34 Js) x (7.50 x 10^14 Hz) = 4.97 x 10^-19 J.
b. The spectral lines are produced by the electrons within the atoms of this element, which can absorb or emit specific amounts of energy to move between different energy levels. These energy transitions result in the emission or absorption of photons with specific wavelengths and frequencies, giving rise to the observed emission spectrum.
c. The violet emission line represents the photon with the most energy since it has the shortest wavelength (400 nm) and highest frequency (7.50 x 10^14 Hz) among the lines shown. This highest energy does not necessarily represent the energy of the valence electrons, but rather corresponds to the specific energy transitions occurring within the atoms of the element.
d. Emission spectra can be used to determine the gases present in the atmosphere of a far-away planet by analyzing the specific wavelengths of the emitted or absorbed light from the planet. Each gas has a unique emission or absorption spectrum, allowing scientists to identify the gases present in the planet's atmosphere.
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A chemist needs to determine the concentration of a sulfuric acid solution by titration with a standard sodium hydroxide solution. He has a 0.1838 M
0.1838
M
standard sodium hydroxide solution. He takes a 25.00 mL
25.00
mL
sample of the original acid solution and dilutes it to 250.0 mL.
250.0
mL
.
Then, he takes a 10.00 mL
10.00
mL
sample of the dilute acid solution and titrates it with the standard solution. The endpoint was reached after the addition of 10.81 mL
10.81
mL
of the standard solution. What is the concentration of the original sulfuric acid solution?
concentration:
Initial solution concentration of the original sulfuric acid solution is 1.66.
How to calculate concentration?We know that Na2SO4 + 2 H2O > H2SO4 + 2 NaOH.The concentration of NaOH has been reported at 0.1678.Volume of NaOH: 19.88 mL (or 0.01988 L)Here are the calculations for NaOH moles: NaOH concentration times volume equals 0.01988 x 0.1678 x 0.00333 moles.Half a mole of NaOH is equivalent to half a mole of in 25 mL of the original solution, which is equivalent to 0.00166 mol in 10 mL of the diluted solution. 250 mL of the diluted solution divided by 10 is equal to 0.0415 mol.Initial solution concentration = moles/volume = 0.0415/0.025 = 1.66For more information on concentration kindly visit to
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where are chemicals found in the home?
a. only in the bathroom
b. only in locked cabinets
c. in every room
d. only in the kitchen
Answer:
c
Explanation:
chemicals can be found in every part of our lives
Why are the united nation members upset with Wakanda?
The "Wakanda speech," six weeks have passed, and the world is still in shock.
Thus, Global leaders and analysts were taken aback by King T'Challa's declaration at the United Nations General Assembly that the Kingdom of Wakanda is not a developing country of textiles, farms, and shepherds with a GDP per person of roughly $760 but rather a technological superpower and Wakanda speech.
The country's widespread employment of cutting-edge magnetic levitation trains, flying machines, opaque holograms, and spinal cord-healing beads has led to the coining of the phrase "uber-developed" nation.
The most watched video ever is currently "Welcome to the Future," an introduction video created by Wakanda's recently established Ministry of Foreign Affairs.
Thus, The "Wakanda speech," six weeks have passed, and the world is still in shock.
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Yolanda is focusing on eccentric contractions during her workout today. How is this MOST likely demonstrated in her workout?
Identify the following for an atom with 8 protons, 8 electrons, and 7 neutrons.
a. Atomic number:
b. Mass number:
c. Nuclear Notation:
d. Hyphen Notation:
please help
Answer:
i thinks its a. but iam not sure
Select the correct answer.
Which is an intermediate in this reaction mechanism:
step 1: H202 + 1 - H20 + O
step 2: H202 + or - H20 + O2+1"
A. H202
B.I-
C.OI-
D.O2
Answer:
I^-
Explanation:
Usually in these reactions we use palladium (pd) or platinum (pt) or halogens
Intermediate is the elements which runs the reaction.
Here iodine is doing that.
so option B is correct
a hot liquid located under earth's surface?
Answer:
Magma
Explanation:
Magma is the hot liquid under earths surface
A 1.8 mole sample of a compound weighs 195 g and is found to be 11.18% H and 88.82% C. What is the molecular formula for the compound?
Answer:
C8H12
Explanation:
First find the molar mass
195/1.8 × 1 = 108.3 gmol-1
Then the molecular formula
Mass of C in 1 mole of compound = 88.82×108.3/100
= 96.2 g
Mass of H in 1 mol of.the compound = 108.3×11.18/100 = 12.11 g
Divide the mass by their molar masses to get no. of moles in 108.3 g of compound or 1 mole of compound
Moles of C in one Mole of compound = 96.2g/12 gmol-1 = 8 mol
Moles of H in 1 mole of compound = 12.11g/1 gmol-1 =12 mol
Since we need the molecular formula it's C8H12
HQ5.40
Homework Answered Due Today, 11:59 PM
The reaction 3H₂(g) + N₂(g) → 2NH3(g) has an enthalpy of reaction of -92.6 kJ/mol. If 1 g of hydrogen and 2 g of nitrogen are
reacted, how much heat is produced (kJ)?
The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ
How do i determine the heat energy produced?First, we shall obtain the limiting reactant. Details below:
3H₂ + N₂ -> 2NH₃
Molar mass of N₂ = 28 g/molMass of N₂ from the balanced equation = 1 × 28 = 28 g Molar mass of H₂ = 2 g/molMass of H₂ from the balanced equation = 3 × 2 = 6 gFrom the balanced equation above,
28 g of N₂ reacted with 6 g of H₂
Therefore,
2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂
We can see that only 0.43 g of H₂ is needed in the reaction.
Thus, the limiting reactant is N₂
Finally, we the amount of heat energy produced. Details below:
3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ
Molar mass of N₂ = 28 g/molMass of N₂ from the balanced equation = 1 × 28 = 28 gFrom the balanced equation above,
When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.
Therefore,
When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ
Thus the heat energy produced from the reaction is -6.61 KJ
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A 19.66 g sample of chromium is heated in the presence of excess bromine. A metal bromide is formed with a mass of 110.3 g. Determine the empirical formula of the metal bromide.
To determine the empirical formula of the metal bromide formed, we need to first calculate the amount of chromium reacted and the amount of bromine reacted. The amount of chromium reacted can be calculated using its molar mass, which is 52 g/mol: 19.66 g chromium x (1 mol chromium / 52 g chromium) = 0.378 mol chromium.
Since there is excess bromine, all of the chromium would react with bromine to form the metal bromide. Therefore, the amount of bromine reacted can be calculated using the mass of the metal bromide formed:
110.3 g metal bromide x (1 mol metal bromide / molar mass of metal bromide) = amount of bromine reacted
We don't know the molar mass of the metal bromide yet, but we can use the law of conservation of mass to determine it. The mass of the metal bromide formed must equal the sum of the masses of the chromium and bromine that reacted.
110.3 g metal bromide = 19.66 g chromium + mass of bromine reacted mass of bromine reacted = 90.64 g
Now we can calculate the amount of bromine reacted:
90.64 g bromine x (1 mol bromine / 79.904 g bromine) = 1.133 mol bromine
To determine the empirical formula, we need to find the ratio of the moles of each element in the metal bromide.
Chromium: 0.378 mol
Bromine: 1.133 mol
To get a whole number ratio, we can divide both of these values by the smaller value (0.378 mol):
Chromium: 0.378 mol ÷ 0.378 mol = 1
Bromine: 1.133 mol ÷ 0.378 mol = 3
Therefore, the empirical formula of the metal bromide is CrBr3.
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