Answers
Answer:
Mass = 0.158 g
Explanation:
Formula used,
P V = n R T
Or,
n = P V / R T
Putting values,
n = 0.948 atm . 0.025 L / 0.0821 L.atm.K⁻¹.mol⁻¹ . 291.45
n = 0.00099 mol
Note: we have changed pressure from mmHg to atm, volume from mL to L and temperature from C to K)
Also,
Mass = n . Molecular Mass
Mass = 0.00099 mol × 159.808 g/mol
Mass = 0.158 g
Related Questions
solution of nitric acid is 60% with the specific gravity 1.15 calculate the volume of the seed required to prepare 250 ml semi normal solution
Answers
Answer:
This dilution problem uses the equation
M
a
V
a
=
M
b
V
b
M
a
= 6.77M - the initial molarity (concentration)
V
a
= 15.00 mL - the initial volume
M
b
= 1.50 M - the desired molarity (concentration)
V
b
= (15.00 + x mL) - the volume of the desired solution
(6.77 M) (15.00 mL) = (1.50 M)(15.00 mL + x )
101.55 M mL= 22.5 M mL + 1.50x M
101.55 M mL - 22.5 M mL = 1.50x M
79.05 M mL = 1.50 M
79.05 M mL / 1.50 M = x
52.7 mL = x
59.7 mL needs to be added to the original 15.00 mL solution in order to dilute it from 6.77 M to 1.50 M.
Explanation:
Soap chemical name and chemical formula
plsss help
Answers
Answer:
the chemical name for soap is a lot, for example there is Sodium Talowate, Sodium Palmate, and even Sodium Cocoate, but there is more
Explanation:
the chemical formula for it is RCOO-Na+ it has 12 - 18 carbon atoms.
Three sections of the periodic table are labeled A, B, and C in the image below.
Which of the following statements is most likely true for an element present in section A?
It is dull and brittle.
It is malleable and ductile.
It is a liquid at room temperature.
It is a poor conductor of electricity.
Answers
The statement which is most likely true for an element present in section A is they are dull and brittle. They belongs to Post- Transition elements. Hence option (A) is the correct answer.
What are Post transition elements ?Soft or brittle, poor mechanical strength.
Melting points lower than transition metals.
Boiling points are also usually lower than transition metals.
Covalent or directional bonding shown by crystalline structures.
High density.
Hence, The statement which is most likely true for an element present in section A is they are dull and brittle. Hence option (A) is the correct answer.
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it is not dull and brittle.
In comparing a 0.25 molality aqueous NaCl solution to a 0.25 molality aqueous CaCl 2 solution:
a. the NaCl solution has the higher boiling point and the CaCl2 solution has the lower freezing point.
b. the NaCl solution has the higher boiling point and the lower freezing point.
c. the CaCl2 solution has the higher boiling point and the lower freezing point.
d. the CaCl2 solution has the higher boiling point and the NaCl solution has the lower freezing point.
e. both solutions have the same boiling point and the same freezing point.
Answers
Answer:
d
Explanation:
higher no of particles are in CaCl2 solution
The depression in freezing point, elevation in boiling point, etc. are known as colligative particles. Here the CaCl2 solution has the higher boiling point and the NaCl solution has the lower freezing point. The correct option is D.
What are colligative properties?The properties of a dilute solution which depend only on the number of solute particles present in a given amount of solvent, and not in any way upon the nature of the solute particles are called colligative properties.
The elevation in boiling point is:
ΔTb = i × Kb × m
Here 'i' is the Van't Hoff factor, Kb is constant and 'm' is the molality.
The boiling point depends on the number of ions present in the electrolyte and the concentration. The number of ions in CaCl₂ is 3 whereas the number of ions in NaCl is 2.
ΔTb of CaCl₂ = 3 × 0.25 = 0.75
ΔTb of NaCl = 2 × 0.25 = 0.5
Similarly the freezing point depends on the number of particles of the electrolyte.
So CaCl₂ has boiling point and NaCl has low freezing point.
Thus the correct option is D.
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Stephan’s mother cuts a twig from a rose bush and plants it in the soil. After a few days, Stephan observes a new plant growing. Which characteristic does the growth of the new plant depict?
Answers
The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.
Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.
The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.
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John Adams was the first US president to
Answers
Answer:
To live in the White House
Explanation:
While George Washington was in office, the white house was still in the stages of being built. Hence John Adams was the first president to reside and live in the White house.
Answer:
It's B to live in the white house.
Explanation:
A student is making a solution of sodium carbonate (Na2CO3) they mix 0.79 grams of sodium carbonate into 50.0 mL of water. What is the molarity of the sodium carbonate solution?
A 0.15 M Na2CO3
B 1.5 x 10^-4 M Na2CO3
C 6.7 M Na2CO3
D 15.8 M NaCO3
Answers
Answer:
[Na₂CO₃] = 0.15 M
Explanation:
Molarity is a type of concentration.
It is useful for solutions, to say how many moles of solute are contained in 1L of solution.
We can also say, that molarity are the mmoles of solute in 1 mL of solution.
In this case, our solute is the Na₂CO₃.
We convert mass to moles: 0.79 g . 1 mol / 106g = 7.45×10⁻³ moles
We convert moles to mmoles: 7.45×10⁻³ mol . 1000 mmol / 1mol = 7.45 mmol
M = mmol / mL
M = 7.45 mmol / 50 mL = 0.15 M
Option A is the right answer.
Bleach is more basic than egg whites.
Bleach is more basic than egg whites.
Egg whites are more basic than bleach.
Egg whites are more basic than bleach.
Bleach is more acidic than egg whites.
Bleach is more acidic than egg whites.
Egg whites are more acidic than bleach.
Answers
I dont know how to do percent error.
Answers
Answer:
I'm pretty sure its the percent difference between the two (starting mass and mass retrieved)
Explanation:
Don't blame me if I'm wrong :x
Ocean water contains 3.3 % NaCl by mass.
How much salt can be obtained from 234g of seawater?
Answers
Answer:
Ans: 8.9 NaCl
Explanation:
Ocean water contains 3.5 nacl by mass how much salt can be obtained from 254 g of seawater
Question: Ocean water contains 3.5% NaCl by mass. How much salt can be obtained from 254g of seawater?
What is the amount of energy required to move an electron from one level to another called?; Is the amount of energy required to move an electron?; How does an electron move between energy levels?; What is an energy orbital?
Answers
The term "quantum" refers to the amount of energy needed to move an electron from one energy level to the next higher one.
It also applies here when it comes to moving electrons between levels because it refers to the smallest amount of energy required to do anything. It is a part of quantum physics, which deals with quantum theory and studies levels at which things are molecular, atomic, and subatomic.
A process known as absorption occurs when an atom transitions from its ground state to an excited state by absorbing energy from its surroundings. The electron takes in the energy and advances to a higher level of energy. By dissipating the extra energy it took in during the emission process, the electron returns to the ground state.
The energy of orbitals is the energy required to move an electron from one orbital to another or the energy released when an electron is added from another orbital.
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CO, (9) +2NH_(9) - CO(NH,) (s) +H, O(1)
a. What is the maximum mass of urea, CO(NH), that can be manufactured from the reaction of 2.20 moles of CO2 with sufficient amount of ammonia.
Answers
The mass of the ammonia that is required is 258 g.
What is the stoichiometry of the reaction?
The quantitative correlations between the reactants and products in a chemical reaction are the focus of the chemistry subfield known as stoichiometry.
We have to know that;
1 mole of CO2 produces 1 mole of urea
2.2 moles of CO2 produces 2.2 urea
Given that the number of moles of urea = 455 g/60 g/mol
= 7.58 moles
Now;
2 moles of NH3 produces 1 mole of urea
x moles of NH3 produces 7.58 moles of urea
x = 7.58 * 2/1
= 15.16 moles
Mass of the ammonia = 15.16 moles * 17 g/mol
= 258 g
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BRAINLIEST:
Answer this questions with steps to get 20 POINTS:
1. How many moles of nitrous acid will be produced when 0.55 moles of tetranitrogen hexoxide reacts with water?
Answers
A local barista serves coffee at 85°C. You add ice to the coffee to cool it to 55°C. Assume that an ice cube is 24 g and -18.5°C. How many ice cubes would you need to add to your 355 mL cup of coffee to bring it to 55°C? The specific heat of ice is 2.05 J/g°C, the specific heat of water is 4.184 J/g°C, and the specific heat of fusion of water is 334 J/g. Remember that an ice cube will need to be warmed to 0°C, will melt, and then the newly melted water will be warmed to 55°C.
A. 1
B. 2
C. 3
D. 4
Answers
To solve this problem, we need to consider the energy required to warm the ice cube from -18.5°C to 0°C, the energy required to melt the ice cube, and the energy required to warm the melted water from 0°C to 55°C. Let's calculate the energy for each step and determine the number of ice cubes needed.
Warming the ice cube to 0°C:
The specific heat capacity of ice is 2.05 J/g°C. The temperature change is from -18.5°C to 0°C. Therefore, the energy required to warm the ice cube can be calculated as:
Energy = mass × specific heat capacity × temperature change
Energy = 24 g × 2.05 J/g°C × (0°C - (-18.5°C))
Energy = 24 g × 2.05 J/g°C × 18.5°C = 899.4 J
Melting the ice cube:
The heat of fusion (specific latent heat of fusion) of water is 334 J/g. We need to determine the energy required to melt the ice cube. The mass of the ice cube is 24 g, so the energy required can be calculated as:
Energy = mass × heat of fusion
Energy = 24 g × 334 J/g = 8016 J
Warming the melted water from 0°C to 55°C:
The specific heat capacity of water is 4.184 J/g°C. We need to determine the energy required to warm the melted water from 0°C to 55°C. The mass of the melted water can be calculated by subtracting the mass of the ice cube that melted from the initial mass of the ice cube (24 g).
Mass of melted water = 24 g - 24 g = 0 g (since all the ice melted)
Therefore, no additional energy is required for this step.
Now, let's add up the energy required for each step to determine the total energy needed to cool the coffee from 85°C to 55°C:
Total energy required = Energy to warm the ice cube to 0°C + Energy to melt the ice cube
Total energy required = 899.4 J + 8016 J = 8915.4 J
Given that each ice cube provides 8915.4 J of energy, we can determine the number of ice cubes needed to cool the coffee.
Energy per ice cube = 8915.4 J
Energy required to cool the coffee = Total energy required = 8915.4 J
The number of ice cubes needed = Energy required to cool the coffee / Energy per ice cube
Number of ice cubes needed = 8915.4 J / 8915.4 J = 1
Therefore, you would need to add 1 ice cube to your 355 mL cup of coffee to bring it to 55°C.
The correct answer is A. 1.
Share what you have learned about first aid to your family......
please help me with this.
Answers
Answer:
\( \huge\pink{ \mid{ \underline{ \overline{ \tt Answer :- }} \mid}}\)
=> First Aid enables you to assist persons who become injured in the event of an accident or emergency situation until help arrives.
\( \huge\blue{ \mid{ \underline{ \overline{ \tt Situations :- }} \mid}}\)
=> If an accident happens in the workplace, in your home or in a public space, you can use the help of a first aid kit.
=> In situations such as when someone ingests a harmful substance, suffers from a heart attack, a seizure or stroke, is involved in a motor vehicle accident or is caught in a natural disaster, a person trained and knowledgeable in even the very basics of First Aid can be of extreme importance in assisting the injured person(s) until emergency responders arrive.
Material use make car tyres and chewing gum?
Answers
Answer:
Rubber
Rubber
Make me brainlyist
A scientist added bacteria and a nutrient medium that could support the growth of the bacteria to a sterilized petri dish. No other materials were added. The graph models the growth of the bacteria over time.
Answers
Answer:
A scientist added bacteria and a nutrient medium that could support the growth of the bacteria to a sterilized petri dish. No other materials were added. The graph models growth of the bacteria over time. ... The bacteria did not reproduce in the system, and eventually each individual died at the end of its life cycle.
Explanation:
Plz mark brainliest thanks
6. Calculate the molecules of candle wax burned
Answers
Answer:
Paraffin wax's general chemical formula is CnH2n+2, according to ChemistryViews, with n being a varying number of carbon atoms. Although the chemical composition of the wax is always carbon and hydrogen, the actual number of atoms will vary based on the exact origin of the wax.
Answer:
podi mate mairu suthu naaye
Explanation:
poda mairu suthu naaye
Write down a balanced equation for SnO2 + H2 → Sn + H2O and tell which substance is the oxidising agent and which is the reducing agent.
Answers
Answer:
Sn is the oxidation agent and h2 is the reducing agent
Explanation:
Because oxidation agent means reduction which means the lose of oxygen and Sn lose oxygen.
While reduction agent means oxidation which also means the gain of oxygen and h2 gain oxygen.
I hope you understand my explanation if you need any help in chemistry I'm always here
5. Neon has two major isotopes. Neon-20 and Neon-22. Out of every 250 neon atoms, 225 will be Neon-20
(19.992 g/mol), and 25 will be Neon-22 (21.991 g/mol). What is the average atomic mass of Neon?
Answers
Answer:
20.1974
Explanation:
The Atomic mass will be the same for every isotope as the number of Neutrons changes, not the number of protons.
Neon has two major isotopes. Neon-20 and Neon-22. Out of every 250 neon atoms, 225 will be Neon-2(19.992 g/mol), and 25 will be Neon-22 (21.991 g/mol), then the average atomic mass of Neon20.1974
What are the difference between atomic number and atomic mass ?Atomic mass of an element can be defined as the total number of neutrons and protons present in the nucleus of an atom and the atomic number is the number of protons present in nucleus.
the average weight of an element is called as atomic mass while atomic number is total number of protons present in the central nucleus of the atom. Atomic mass is presented a symbolic representation of A where as atomic number is represented by the letter Z.
Atomic mass can not classified which type of element where as Atomic number classify and identify the type of element, there are different types of isotopes of an element observed on the basis of their atomic mass where as isotopes only share the same atomic number.
Neon has two isotopes such as , N e 20, N e 21 and N e 22.The average atomic mass can be calculated as:
N e Average atomic mass = [ 19.9924 (90.92 %)] + [ 20.9940 (0.257 %)] + [ 21.9914 (8.82 %)] a m u
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NaOH is the limiting reactant, producing
2.0 mol Na3PO4. What mass of
Na3PO4 forms during the reaction?
Na3PO4: 164 g/mol
[?] g Na3PO4
Report your answer to two significant figures.
g Na PO
4
Enter
Answers
The mass of Na₃PO₄ formed during the reaction is 328 g.
The balanced chemical equation for the reaction is:
\(3NaOH + Na_3PO_4 - > 3Na_2PO_4 + H_2O\)
From the equation, we can see that 3 moles of NaOH produce 1 mole of Na₃PO₄.
Given that 2.0 moles of Na₃PO₄ is produced, we can set up a proportion to find the amount of NaOH required:
3 mol NaOH / 1 mol Na₃PO₄ = x mol NaOH / 2.0 mol Na3PO4
Solving for x, we get:
x = (3 mol NaOH / 1 mol Na₃PO₄) × (2.0 mol Na₃PO₄ / 1) = 6.0 mol NaOH
So, 6.0 moles of NaOH are required to produce 2.0 moles of Na₃PO₄.
To find the mass of Na₃PO₄ produced, we can use its molar mass:
mass = moles × molar mass = 2.0 mol × 164 g/mol = 328 g
Therefore, the mass of Na₃PO₄ formed during the reaction is 328 g.
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A solution is prepared by dissolving 108.4 g HCl in enough water to make 150.0 L of solution.
Calculate the H+ concentration, [H+], and pH of this solution.
Answers
The [H⁺] is 0.019 M and the pH of the solution is 1.72
Since HCl is a strong acid with a single ionizable hydrogen ion, the concentration of H⁺ ions will be same as the molar concentration of HCl solution.
\(\rm Molar\ concentration \ of \ HCl\ [HCl] = \frac{no. \ of\ moles\ of\ HCl}{Volume\ of\ the\ solution[L]}\)
\(\rm Number\ of\ moles\ of\ HCl = \frac{Given\ mass}{Molecular\ mass}\)
\(= \frac{108.4}{36.5}\)
\(= 2.96 \ moles\)
Therefore,
\(\rm [HCl] = \frac{2.96}{150.0}\)
\(\rm [HCl] = 0.019\ M\)
Therefore, [H⁺] = 0.019 M
Since, pH = - log [H⁺]
= - log [0.019]
= 1.72
The [H⁺] is 0.019 M and the pH of the solution is 1.72.
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A gold necklace has a mass of 25.6grams and a volume of 1.28cubic centimeters. Calculate its density.
Answers
Answer:25.75
Explanation:
(01.01 LC)What is the body of scientific knowledge based on?
Guesses
Mysteries
Observations
Opinions
Answers
The body of scientific knowledge is based on different Observations (Option C).
What does observations mean in the scientific method?Observations in the scientific method are fundamental because it is the first step to raising scientific questions that may be explained through plausible hypotheses. Subsequently, hypotheses must be tested by experimental procedures.
In conclusion, the body of scientific knowledge is based on different Observations (Option C).
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A sample of hydrogen at 50.6
C exerts a pressure of 237.46 mmHg. If the gas is heated to 73.2 °C at constant volume, what will its new pressure be?
Answers
If the gas is heated to 73.2 °C at constant volume 253.7 mmHg will its new pressure.
What is the quick description of the ideal gas law?The rule that states that the sum of the absolute temperature of the gas and the universal gas constant is equal to the product of the pressure and volume of a single gramme of an ideal gas.
Using the ideal gas law, we may assume that hydrogen is acting optimally as follows:
As the gas is being heated solely and the volume is not changing, thus, n and V are constant and hence we may state
(P1V1) / T1 = (P2V2) / T2
P1 / T1 = P2 / T2
We can then plug in the given values and solve for P2:
P1 = 237.46 mmHg
T1 = 50.6 + 273.15 = 323.75 K (temperature in Kelvin)
T2 = 73.2 + 273.15 = 346.35 K
P2 = P1 * T2 / T1
P2 = 237.46 * 346.35 / 323.75
P2 = 253.7 mmHg.
If the gas is heated to 73.2 °C at constant volume 253.7 mmHg will its new pressure.
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How many molecules are in 6.5 moles of hydrochloric acid, HCl?
Answers
Answer:
There are two moles HCl formed for each mole of Cl2, hence 2 x 0.141 = 0.282 moles HCl is produced. = 0.282 x (1.008 + 35.45) = 10.3 g. (1.)
What element has an atomic mass 4?
Answers
Answer:
Helium has atomic mass 4.002602.
So the answer to yr question is helium.
What determines the change of an ion formed by an atom
Answers
Answer:
Ions are formed when the number of protons in an atom does not equal the number of electrons. If more protons are present, the ion is positive and is known as a cation; if more electrons are present, the ion is negative and referred to as an anion. Ions are highly reactive species.
Explanation:
Answer:
An atom becomes charged when the number of protons does not equal the number of electrons. For example, if an element has six protons but only five electrons, the net charge of the element is +1. Conversely, if an element has six protons but seven electrons, then the net charge of the element is -1.
Explanation:
How many Hydrogen atoms are in 4HN₃?
Answers
I need to know the electron geometry and the molecular shape
Answers
In determining the shape of a molecule, the electron geometry includes both bond pairs and lone pairs. But the molecular geometry excludes the lone pairs while determining the shape of molecule.
What is VSEPR theory?The valence shell electron pair repulsion theory is proposed by the scientists Sidgwick and Powell to predict the shapes of the molecules. This theory is based on the assumption that valence shell electron pairs repel each other and are oriented in space as far apart as possible to minimize the mutual repulsion.
Electron geometry Molecular shape
NO₂⁺ Bent Linear
PCl₃ Tetrahedral Trigonal pyramidal
BCl₂H Bent Trigonal planar
ClO₃⁻ Tetrahedral Trigonal pyramidal
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