10/24/22

80.0 g sample of a gas was heated from 25∘C to 225∘C. During this process, 346 J of work was done by the system and its internal energy increased by 6905 J. What is the specific heat of the gas?
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10/24/22

If you combine 260.0 mL of water at 25.00 ∘C and 120.0 mL of water at 95.00 ∘C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.
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10/24/22

What is the pH?
What is the pH of a solution of 0.300 M HNO₂ containing 0.220 M NaNO₂? (Ka of HNO₂ is 4.5 × 10⁻⁴)
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10/24/22

How to prepare buffer?
What ratio of CH₃NH₂ to CH₃NH₃⁺ is needed to prepare a pH 10.30 buffer? (Kb for CH₃NH₂ is 4.4 × 10⁻⁴)I got 0.23 but it said I was off by a factor of 2
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10/24/22

What is the pH?
What is the pH of a 0.450 M solution of Ca(NO₂)₂ (Ka of HNO₂ is 4.5 × 10⁻⁴)?
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10/24/22

In the reaction CaCO3(s)⟶CaO(s)+CO2(g) how many liters of carbon dioxide gas, CO2 , measured at STP are produced from the decomposition of 195 g of calcium carbonate, CaCO3 ?
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10/23/22

Dissociation and pH
A buffer solution was obtained by 8.3g of acetic acid and 16.0g of sodium acetate. The buffer solution was diluted to 1litre. Calculate the pH of the solution if 0.7mol of 1ml HCl is added to... more
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10/23/22

Need help with chemistry question as soon as possible (assignment due very soon)
"How many milliliters of a solution that is 10.85% (w/w) HNO3 with a density of 1.2630 g/mL should be diluted to make 2.00 L of a 0.225 M HNO3 solution?"
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10/23/22

Which of the following salts will be substantially more soluble in acidic solution than in pure water? Briefly explain your answers. ZnCO3, ZnS, BiI3, AgCN, Ba3(PO4)2
Which of the following salts will be substantially more soluble in acidic solution than in pure water? Briefly explain your answers.ZnCO3, ZnS, BiI3, AgCN, Ba3(PO4)2
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10/23/22

Calculate the molar solubility of AgBr in:
a. 0.0300 M AgNO3 solutionb. 0.100 M NaBr solution
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10/23/22

General Chemistry
Copper(II) ions can be displaced by aluminum metal.3 CuSO4(aq) + 2 Al(s) → Al2(SO4)3(aq) + 3 Cu(s)How many grams of Al would be needed to displace all of the copper ions in 37.9 mL of 0.550 M... more
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10/23/22

100 mL of a saturated solution of SrF2 contains 0.011 g of SrF2. What is the Ksp of SrF2?
100 mL of a saturated solution of SrF2 contains 0.011 g of SrF2. What is the Ksp of SrF2?
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10/23/22

Chem Titrations

In a certain reaction, 17.2 mL of 0.600 M H2SO4 is fully neutralized by 19.4 mL of NaOH of unknown molarity. Calculate the molarity of the NaOH. a. 0.266 M b. 0.532 M c. 1.35 M d. 1.06 M
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10/23/22

Question is in the description
The average kinetic energy of the molecules in a gas sample depends only on the temperature, 𝑇.T. However, given the same kinetic energies, a lighter molecule will move faster than a heavier... more
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10/22/22

Calculate the maximum mass of sodium bromide that could be produced by the chemical reaction. Be sure your answer has the correct number of significant digits. 
Aqueous hydrobromic acid HBr will react with solid sodium hydroxide NaOH to produce aqueous sodium bromide NaBr and liquid water H2O.Suppose 3.24 g of hydrobromic acid is mixed with 2.9 g of sodium... more
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10/22/22

Calculate the pH at the equivalence points for titrating 0.200 M solutions of each of the following bases with 0.200 M HBr.
a. hydroxylamine (NH2OH)b. aniline (C6H5NH2)
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10/22/22

How many mL of 0.0850 M NaOH are needed to titrate each of the following solutions to the equivalence point?
a. 40.0 mL of 0.900 M HNO3.b. 35.0 mL of 0.0850 M HC2H3O2.
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10/21/22

How many kilojoules are required to raise the temperature of a 2.119 g sample of iron from 25.0C to 35.0C? Iron has a specific heat of 0.450 J/j*C.
The correct answer listed is 0.032; however, we keep getting 0.01 once rounded to two digits in the decimal.
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10/21/22

limiting reactant
explain what a limiting reactant is and the process to determine the limiting reactant in the example listed Given 3.4 grams of X element with a molar mass of 35g/mol and 4.2grams Y element with a... more
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10/21/22

How to prevent value of gas from expanding if it's mass is increased

What are the conditions to prevent value of give gas from expanding if it's mass is increased
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10/21/22

A buffer solution contains 0.100 mole of propionic acid and 0.130 mole of cesium propionate (CsC3H5O2) in 2.00 L of solution.
a. What is the pH of this buffer?b. What is the pH of this buffer after the addition of 0.015 mole of HI?
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10/21/22

I don't understand how to get the solution
A 16.0 L helium tank is pressurized to 22.0 atm. When connected to this tank, a balloon will inflate because the pressure inside the tank is greater than the atmospheric pressure pushing on the... more
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10/21/22

how would you find the solution?
A mixture of He, N2, and Ar has a pressure of 21.0 atm at 28.0 °C. If the partial pressure of He is 2427 torr and that of Ar is 1787 mm Hg, what is the partial pressure of N2?𝑃N2=
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10/21/22

A buffer is formed by mixing 20.0 g of HC2H3O2, 20.0 g of NaC2H3O2, and enough water to form 2.00 L of solution.
a. Write the net ionic equation for the reaction of the buffer with a few drops of chloric acid.b. Write the net ionic equation for the reaction of the buffer with a few drops of lithium hydroxide.
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10/21/22

Find the pH of each of the following solution
A solution made by mixing 40.0 mL of 0.15 M acetic acid (HC2H3O2) with 60.0 mL of 0.20 M sodium acetate (NaC2H3O2).
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