Answers
Molarity of the original calcium hydroxide solution = (16.5 ml x 3.04 m KOH) / 32.8 ml = 0.95 m
Step 1: Calculate the moles of perchloric acid in the original solution:
Moles of perchloric acid = (1.41 m)(51.8 ml) = 72.3 moles
Step 2: Calculate the moles of calcium hydroxide in the original solution:
Moles of calcium hydroxide = (32.8 ml)(1 M) = 32.8 moles
Step 3: Calculate the moles of potassium hydroxide needed to reach neutrality:
Moles of potassium hydroxide = (16.5 ml)(3.04 M) = 49.76 moles
Step 4: Calculate the moles of calcium hydroxide in the solution after the addition of the potassium hydroxide:
Moles of calcium hydroxide = 32.8 moles + 49.76 moles = 82.56 moles
Step 5: Calculate the molarity of the calcium hydroxide in the original solution:
Molarity of calcium hydroxide = (82.56 moles)/(32.8 ml) = 2.52 M
Molarity is a measure of the concentration of a solute in a solution. It is expressed as the number of moles of solute per liter of solution (mol/L). It is used to calculate the amount of a solute that must be added to a solution to achieve a desired concentration. It is also used to measure the amount of a substance in a given volume of solution. Molarity is a key concept in chemistry, and is important to understand when discussing the behavior of solutions and the reactions they undergo.
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Related Questions
Science has had no negative impacts on society. Please select the best answer from the choices provided T F
Answers
Answer:
false
Explanation:
not all science is good, or has good effects
False.
Science can possibly be dangerous when used by the wrong people. It can be used to create bombs, bioweapons, and much more.
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Strong acids and bases ____________ dissociate into the respective ions, while weak acids and bases only partially ________ into the H+ and OH- ions.
(60 points)
Answers
Answer:
Strong acids and bases completely dissociate into the respective ions, while weak acids and bases only partially dissociate into the H+ and OH- ions.
Answer: completely and dissociate
Explanation: Strong acids and bases completely dissociate into the respective ions, while weak acids and bases only partially dissociate into the H+ and OH- ions.
an iron or sample was dissolved in hydrochloric acid and the iron was obtained as Fe2+ (aq). The iron solution was titrated with 36.35 mL of 0.493 M Ce4+ Solution according to the balanced chemical reaction: Ce4+(aq)+Fe2+(aq)->Ce3+(aq)+Fe3+(aq) calculate the mass of iron in the original or sample.
Answers
Around 0.999 grams of iron made up the initial sample. Mathematical definitions of molarity include: Molarity is equal to the quantity of solute in moles.
What does molarity mean in chemistry?By dividing the number of moles of HCl even by volume (L) of a solution in which they were dissolved, we may get the acid solution's molarity: moles of Ce4+ = Molarity Volume (in liters)
By substituting the values specified in the problem, we obtain:
Ce4+ moles equal 0.493 M 0.03635 L 0.0179 moles.
As the reaction requires the same number of moles of Fe2+ and Ce4+, we may state that:
Fe2+ mole equivalent: 0.0179 moles
We must translate the moles of Fe2+ into grams if iron using molar mass of Fe in order to determine the amount of iron with in original sample. A mol of iron has a molar mass of 55.845 g.
Fe2+ molar mass is equal to 0.0179 moles, or 55.845 g/mol, times the mass of Fe, making Fe mass equal to 0.999 g.
What is molarity, and what does its SI unit mean?Mathematical definitions of molarity include: Molarity is equal to the quantity of solute in moles. number of litres in the solution. The volume of the solution will be in litres (L), as the quantity of moles per solute was measured in moles. Therefore, mol L – 1 is the unit of molarity.
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Early chemists, known at the time as alchemists, had a difficult time understanding the Law of Conservation of Mass. Using the burning of wood as an example, what property of matter made this law difficult for early scientists to understand?
Answers
So, in other words, mass cannot be created nor destroyed.
In a burning log, the initial mass of the wood and the ashes that are left behind after it burns are different, which would seem to violate the law of conservation of mass.
The law of conservation of mass states that, for any isolated system, the mass can neither be created nor be destroyed
After burning a log, the remains that are left behind after it burns are lesser than what would initially seem. There is a difference in mass before the burning of the log after the burning of the log. This seems like a violation of the law of conservation of mass, which would have made it difficult for early chemists to understand it. But if we consider the surroundings as a system then we can see that the mass that is lost in burning is actually converted into smoke and energy or forming other forms of substances. Then considering the whole system we can see that the mass and energy are conserved and interrelated.learn more about conservation of mass and energy:
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What is molality mean
Answers
Answer:
Molality (m), or molal concentration, is the amount of a substance dissolved in a certain mass of solvent. It is defined as the moles of a solute per kilograms of a solvent.
Explanation:
Look in Dictionary
Rough ER is connected to the nucleus membrane and to
Answers
Rough ER is connected to the nuclear membrane and is responsible for the synthesis and processing of proteins.
The rough endoplasmic reticulum (ER) is a network of membrane-bound sacs and tubules that is studded with ribosomes on its surface. These ribosomes are responsible for protein synthesis. The rough ER is connected to the nuclear membrane because it receives instructions for protein synthesis from the DNA in the nucleus. This connection allows for the efficient transfer of genetic information from the nucleus to the rough ER.
Once the ribosomes on the rough ER synthesize proteins, the rough ER is also involved in the processing and modification of these proteins. It helps in folding the newly synthesized proteins into their functional three-dimensional shapes and also adds various modifications such as glycosylation (the addition of sugar molecules) or signal sequences that target the proteins to specific locations within or outside the cell.
After processing, the proteins may be transported to other parts of the cell or exported to the cell membrane or extracellular space. The connection between the rough ER and the nuclear membrane ensures a coordinated flow of genetic information and protein synthesis, allowing the cell to efficiently carry out its functions.
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Epinephrine is a hormone secreted into the bloodstream in times of danger and stress. It is 59% Carbon, 7.1% Hydrogen, 26.2% Oxygen and 7.7% Nitrogen by mass. Determine the empirical formula. The molar mass is 148 g/mol.
Answers
Based o the percentage masses of the elements, the empirical formula of epinephrine is C₉H₁₃O₃N.
What is the empirical formula of epinephrine?The empirical formula of epinephrine is calculated below as follow:
Mole ratio of the elements are determined:
Carbon = 59% / 12
Carbon = 0.049 moles
Hydrogen = 7.1% / 1
Hydrogen = 0.07 moles
Oxygen = 26.2% / 16
Oxygen = 0.016
Nitrogen = 7.7% / 14
Nitrogen = 0.0055
The simplest whole-number ratio will be:
C = 0.049/0.0055
C = 9
Hydrogen = 0.07/0.0055
H = 13
Oxygen = 0.016/0.0055
Oxygen = 3
Nitrogen = 0.0055/0.0055
Nitrogen = 1
The empirical formula = C₉H₁₃O₃N
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Explain the relashionship between carbon dioxide, the human population and use of fossil fuels.
Answers
Answer:
More people means more demand for oil, gas, coal and other fuels mined or drilled from below the Earth's surface that, when burned, spew enough carbon dioxide (CO2) into the atmosphere to trap warm air inside like a greenhouse
Explanation:
hope this helps
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B and I chemical formula?
Answers
Which of the following is an incorrect representation for a neutral atom?
36Li
613C
3063Cu
1530P
Answers
This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li
To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.
Let's analyze the given representations:
36Li:
This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.
613C:
This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.
3063Cu:
This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.
1530P:
This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.
Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.
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The total pressure of gas collected over water is 770.0 mmHg and the temperature is 23.0 degrees Celsius what is the pressure of hydrogen gas formed in mmHg?
Answers
Given that the total pressure of gas collected over water is 770.0 mmHg, we can assume that this gas mixture contains water vapor and hydrogen gas. We need to determine the partial pressure of hydrogen gas in the mixture.
First, we need to determine the vapor pressure of water at the given temperature of 23.0 degrees Celsius. According to a vapor pressure table, the vapor pressure of water at 23.0 degrees Celsius is 21.1 mmHg.
Next, we can use Dalton's Law of Partial Pressures to calculate the partial pressure of hydrogen gas:
Total pressure = Partial pressure of hydrogen gas + Partial pressure of water vapor
770.0 mmHg = Partial pressure of hydrogen gas + 21.1 mmHg
Partial pressure of hydrogen gas = 770.0 mmHg - 21.1 mmHg = 748.9 mmHg
Therefore, the pressure of hydrogen gas formed in the mixture is 748.9 mmHg.
How many moles of O2 were produced in a decomposition reaction of H2O2 if the pressure was 0.978 atm, the temperature was 27C and the volume of O2 gas collected was 0.082L
Answers
The number of mole of O₂ produced from the decomposition of H₂O₂ is 0.0033 mole
How to determine the number of mole of O₂ producedWe'll begin by obtaining the mole of H₂O₂ that decomposed. This is obatined as follow:
Pressure (P) = 0.978 atmTemperature (T) = 27 °C = 27 + 273 = 300 KVolume (V) = 0.082 LGas constant (R) = 0.0821 atm.L/Kmol Mole of H₂O₂ (n) =?PV = nRT
Divide both sides by RT
n = PV / RT
n = (0.978 × 0.082) / (0.0821 × 300)
n = 0.0033 mole
Finally, we shall determine the number of mole of O₂ produced. This is illustrated below
H₂O₂ -> H₂ + O₂
From the balanced equation above,
1 mole of H₂O₂ decomposed to produce 1 moles of O₂
Therefore,
0.0033 mole of H₂O₂ will also decompose to produce = 0.0033 mole of O₂
Thus, number of mole of O₂ produced from the reaction is 0.0033 mole
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Gizmo Student Exploration: Periodic Trends awner key, Please I need help with this as soon as possible! I have attached what I have so far
Answers
Answer:
I cant see it
Explanation:
A claim has dug a hole for itself in the sand in shallow ocean water
Answers
Answser: GOOD STUFF BRO
Explanation:
f
How many atom of oxygen are in 2mole of O2
Answers
Answer:
12.044 × 10²³ atoms of oxygen
Explanation:
Given data:
Number of atoms of oxygen = ?
Moles of oxygen = 2 mol
Solution:
Avogadro number:
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms of oxygen
2 mole × 6.022 × 10²³ atoms of oxygen / 1 mole
12.044 × 10²³ atoms of oxygen
The temperatures on the inside and outside surface of a wall are 20°C and 5°C respectively. The wall is 8 m wide, 4 m high, and 0.2 m thick.
The thermal conductivity is 0.3 W/m.K.
1
The heat flux through the wall is negative
W/m2. Use two significant figures in your answer.
Answers
Answer:
Heat Flux = - 22.5 W/m²
Explanation:
We can use Fourier's Law of Heat Conduction:
q = -kAΔT/t
q/A = -KΔT/t
where,
q/A = Heat Flux = ?
K = Thermal Conductivity = 0.3 W/m.K
ΔT = Change in Temperature = 20°C - 5°C = 15K
t = Thickness = 0.2 m
Therefore,
Heat Flux = -(0.3 W/m.k)(15 k)/(0.2 m)
Heat Flux = - 22.5 W/m²
Negative sign shows the heat flowing out of the system.
For a reversible reaction, the rate constants for the forward and backward reactions are 2.38×10 −4
and 8.15×10 −5
respectively. The equilibrium constant for the reaction is:
a. 0.342 b. 2.92 c. 0.292 d. 3.42
Answers
The equilibrium constant has a definite value for every reversible reaction at a particular temperature. It varies with change in temperature. The equilibrium constant for the reaction is 2.92. The correct option is B.
What is equilibrium constant?The equilibrium constant can be defined as the ratio of the product of molar concentrations of the products to that of the reactants with each concentration term raised to a power equal to its coefficient in a balanced chemical equation.
The equation of the equilibrium constant is:
Keq = Kf / Kb
Kf - Forward rate constant
Kb - Backward rate constant
2.38 × 10⁻⁴ / 8.15×10⁻⁵
Keq = 2.92
Thus the correct option is B.
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8
Which of the pictures demonstrates a state of matter WITHOUT a fixed shape or fixed
volume?
Answers
Answer:
K
Explanation:
The picture that demonstrates a state of matter without a fixed shape or fixed volume is picture K.
Gases are one of the three states of matter without a fixed shape and volume. They simply take up the shape of their containers and are free to move all about.
Liquids and solids are known to have fixed shape and volume. Liquids are know for their ability to flow. Figure LSolids are rigid bodies. It is the figure Jexplain the relationship (linear or exponential) between rate and concentration including what order the iodate ion would be in.
CONCENTRATIONS
EXP. 1: 0.020
EXP 2: 0.019
EXP 3: 0.017
EXP 4: 0.016
EXP 5: 0.014
EXP 6: 0.013
EXP 7: 0.011
EXP 8: 0.01
EXP 9: 8.6x10^-3
EXP 10: 7.1x10^-3
EXP 11: 5.7x10^-3
EXP 12: 4.3x10^-3
RATE (s^-1):
EXP 1: 0.283
EXP 2: 0.1972
EXP 3: 0.2353
EXP 4: 0.2033
EXP 5: 0.1701
EXP 6: 0.133
EXP 7: 0.10
EXP 8: 0.1234
EXP 9: 0.077
EXP 10: 0.07380
EXP 11: 0.05102
EXP 12: 0.03883
By looking at the reaction mechanism, propose a Rate Law (WITHOUT the value of K). Explain the exponents for each reactant. Also, how does the rate law proposed compared to the relationship between rate and iodate concentration observed in the Rate law question?
Discuss, with respect to collision theory, the changes in the rates result from the changing concentrations of the iodate ion. What would you predict if we repeated these reactions at higher temperatures? Explain using collision theory.
Answers
Based on the given data, the relationship between rate and concentration is exponential.
A proposed rate law for the reaction based on the given data is:
Rate = k[IO3⁻]²[H+]What is the collision theory?Collision theory suggests that the rate of a chemical reaction is proportional to the frequency and energy of collisions between the reactant molecules.
As the concentration of iodate ions decreases, the frequency of collisions between reactant molecules decreases, which leads to a decrease in the rate of the reaction.
At higher temperatures, the kinetic energy of the reactant molecules increases, which increases the frequency and energy of collisions between reactant molecules.
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The Bohr model, although historically important, was limited in it's ability to explain the behavior of more complex elements and ions. To which of the following atoms or ions would you expect the Bohr model to apply? Be, He+, K, Li^2+
Answers
Answer:
He+ and Li^2
Explanation:
Hope it helps!
What is the total number of moles of reactants and products in the
chemical reaction listed below:
2 H₂S +30₂2 H₂O + 2 SO₂
Answers
The total number of moles of reactants and products in the chemical reaction given is 9 moles
How do i determine the total number of moles?The total number of mole of reactants and products in the chemical reaction can be obtained as follow:
2H₂S + 3O₂ -> 2H₂O + 2SO₂
The following were obtained from the above equation:
Mole of H₂S = 2 molesMole of O₂ = 3 molesMole of H₂O = 2 molesMole of SO₂ = 2 molesMole of reactants = Mole of (H₂S + O₂) = 2 + 3 = 5 molesMole of products = Mole of (H₂O + SO₂) = 2 + 2 = 4 molesTotal number of moles =?Total number of mole = Mole of reactants + mole of products
Total number of mole = 5 mole + 4 moles
Total number of mole = 9 moles
Thus, we can say that the total number of mole is 9 moles
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Explain in a paragraph how do you know or can find the number of each subatomic particle using the information on the periodic table. include why the atomic mass of your element on the periodic table is not a whole number or why it is. (PLEASE ANSWER FOR BRAINLEST ANSWER)
Answers
Answer:
A typical atom consists of three subatomic particles: protons, neutrons, and electrons (as seen in the helium atom below). Other particles exist as well, such as alpha and beta particles (which are discussed below). The Bohr model shows the three basic subatomic particles in a simple manner. Most of an atom's mass is in the nucleus—a small, dense area at the center of every atom, composed of nucleons. Nucleons include protons and neutrons. All the positive charge of an atom is contained in the nucleus, and originates from the protons. Neutrons are neutrally-charged. Electrons, which are negatively-charged, are located outside of the nucleus.
Explanation:
If you can answer both please do if not help with the top one please!
Answers
We are required to calculate the percentage yield of sodium carbonate.
We are given this reaction:
\(2NaHCO_3\text{ }\rightarrow Na_2CO_3+H_2O+CO_2\)Given: mass of NaHCO3 = 1.357 g and molar mass =84.01g/mol
mass of Na2CO3 = 0.768g and molar mass = 105.99 g/mol
%Yield = (actual yield/theoretical yield) x 100
We do know the actual yield, which is 0.768 g, but we do not know the theoretical yield.
number of moles of NaHCO3 = 1.357 g/84.01 g/mol
=0.01615 mol
Take the number of moles and multiply by molar ratio and multiply by molar mass of Na2CO3 to the theoretical mass of Na2CO3.
mass of Na2CO3 = 0.01615 mol x (1/2) x 105.99 g/mol
= 0.856 g
%Yield = (0.768/0.856) x 100
%Yield = 89.7%
.
The table shows the students data from an investigation about a plant growth and five plants of the same type what is the best way to display this data for analyst
Answers
Answer:
This question is incomplete
Explanation:
The question is incomplete because of the absence of the table but since the question says there are data from an investigation about a plant growth and five other plants (making six) of the same type, the best way to display this type of data for analyst is to use the grouped bar chart. The grouped bar chart will display the data obtained (from an investigation on plant growth) from different students on each of the six plants (of the the same type).
Colours are usually used to identify the bars (of a group) or could be used to separate the group from other groups but in this case, colours are better used to identify the bars of a group.
calculate h30+ for a 8.86*10^3 hbr solution
Answers
[H₃O⁺] = 8.86 x 10³ M
Further explanationThe dissociation of water :
H₂O(l)⇒H⁺+OH⁻
Hydrogen ions H⁺ bond with H₂O to form H₃O⁺ ions(hydronium ion)
When acid(Hbr acid) is in the presence of water(dissociates), the H⁺ ions bond with water molecules to form hydronium, the reaction :
HBr(aq)+H₂O→H₃O+(aq)+Br−(aq
So Ionization of HBr :
\(\tt HBr\rightarrow H_3O^++Br^-\)
[HBr]= 8.86 x 10³,
From equation ratio [H₃O⁺] : HBr = 1 : 1, so
\(\tt [H_3O^+]=8.86\times 10^3\)
Consider the following reaction: 2N2O5(g) → 4NO2(g) + O2(g) Calculate the volume N2O5 that must decompose completely to produce 9.64 L nitrogen dioxide.
Answers
The volume of \(N_2O_5\) needed to produce 9.64 L of \(NO_2\) is 4.97 L, calculated using stoichiometry and the ideal gas equation.
The given chemical equation is \(2N_2O_5(g) \rightarrow 4NO_2(g) + O_2(g)\) .The volume of \(N_2O_5\) that decomposes completely to form 9.64 L of \(NO_2\) is to be calculated. For this, we can use the concept of stoichiometry. Stoichiometry is a branch of chemistry that deals with the quantitative relationships between reactants and products in a balanced chemical equation.To calculate the volume of \(N_2O_5\) that is needed to produce 9.64 L of \(NO_2\), we will first determine the number of moles of NO2 produced in the reaction. For this, we can use the ideal gas equation, PV = nRT. Here, we have the volume of NO2 and we can assume the pressure and temperature to be constant. Thus, we have PV = nRT, where P = pressure, V = volume, n = number of moles, R = ideal gas constant, and T = temperature. Substituting the given values in the ideal gas equation, we get,n = PV/RT = (1 atm × 9.64 L)/(0.0821 L atm K-1 mol-1 × 300 K) = 0.404 molFrom the chemical equation, we see that 2 moles of \(N_2O_5\) give 4 moles of \(NO_2\). Thus, 0.404 mol of \(NO_2\) must have been produced from (0.404/2) = 0.202 mol of \(N_2O_5\). Using the ideal gas equation, we can also find the volume of 0.202 mol of \(N_2O_5\) at the given conditions. Thus, V = nRT/P = (0.202 mol × 0.0821 L atm K-1 mol-1 × 300 K)/1 atm = 4.97 L. Thus, the volume of \(N_2O_5\) that must decompose completely to produce 9.64 L nitrogen dioxide is 4.97 L.For more questions on stoichiometry
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PLEASEEEEEEE HELPPPP
Answers
Answer:
Magma in earths crust
Explanation:
Determine E° for a galvanic (voltaic) cell if ∆G° = -6.3 kJ/mol and n = 3. (F = 96,500 J/(V･mol))
Answers
The E° for a galvanic cell is 0.000217 volts if ∆G° = -6.3 kJ/mol and n = 3. (F = 96,500 J/(V･mol).
A galvanic cell or voltaic cell, named after the scientists Luigi Galvani and Alessandro Volta, respectively, is an electrochemical cell in which an electric current is generated from spontaneous Oxidation-Reduction reactions. A common apparatus generally consists of two different metals, each immersed in separate beakers containing their respective metal ions in solution that are connected by a salt bridge or separated by a porous membrane.
E°=ΔG°/-nF= -6.3/-3×96500=0.000217 V.
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1.) A substance has a pOH of 5.9. Calculate the [OH-] of the substance and explain how you reached your answer? (30 points) 2.) If the pH of a substance is 3, what is the pOH of the substance? Explain how you reached your answer. (35 points) 3.) Would you expect the [H3O+] concentration of hydrogen sulfide (H2S) to be high or low? Explain your answer. (35 points)
Answers
The pOH of the substance is known to be given by the hydroxide ions. A substance has a pOH of 5.9. The [OH-] of the substance is 7.23.
What is pOH?By estimating the concentration of OH ions in a solution, pOH can be used to gauge both acidic or alkaline a solution is. The OH ion concentration's negative logarithm is known as pOH.
pOH = -\(\rm -Log_{10}[OH]^{-}\)
In this problem,\(\rm -Log_{10}[OH]^{-}\)
pOH = ] = \(\rm -Log_{10}[OH]^{-}\)
- log₁₀[5.9] = 7.23
A substance has a pOH of 5.9. The [OH-] of the substance is 7.23 .
Once you get the value of pOH we will get the value of pH.
pOH = 14 - pH
pH = 14 - 3 = 11
An acid that is weak is \(\rm H_{2} S\). As a result, has a pH of 3.92.
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QUESTION 33
If a 100.-g sample of a metal has a volume of 8.65 mL, what is the density of the metal?
O a, none of these
O b. 11.6 g/mL
c. 0.0865 g/mL
Od 1.16 g/mL
O e. 9 g/mL
Answers
Answer:
B.
Explanation:
Density = mass / volume
mass = 100 grams
volume = 8.65 mL
Density = 100 / 8.65 = 11.56 B.