 # Homework: 1) A mixture of monoprotic acids, lactic acid (HC3H5O3) ...

## Question

Homework:
1) A mixture of monoprotic acids, lactic acid (HC3H5O3) and caproic acid (HC6H11O2) was titrated with 0.0500 M NaOH. A 0.100 g sample of the mixture required 20.4 ml of base for neutralization. What is the weigh percentage of each acid in the sample?

2) A 0.1000 g sample of a mixture of FeSO4 and Fe2(SO4)3 was dissolved in water and titrated with 0.0040 M KMnO4. The titration required 15.8ml of the KMnO4 solution. What is the weight percent of FeSO4 in the original sample?

4) Suppose a sample of limestone contains only CaCO3 and MgCO3. When a 0.4515 g sample of limestone is decomposed by heating, 0.2398 g of mixed CaO and MgO remains. What volume of carbon dioxide gas at 752 torr and 285.3 K will be produced from the thermal decomposition of 50.0 Lbs of limestone?

5) At 25ºC, liquid A has a vapor pressure of 100 torr and liquid B has a vapor pressure of 200 torr. The heat of vaporization of liquid A is 8.5 kcal/mole. The heat of vaporization of liquid B is 4.00 kcal/mole. At what temperature will A and B have the same vapor pressure? (Hint, Use the Clausius-Claperon equation.)

6) A mixture of chromium and zinc weighing 0.362 g was reacted with an excess of hydrochloric acid. After all the metal in the mixture reacted, 225 ml or dry hydrogen gas was collected at 27ºC and 750 Torr. Determine the mass percentages of Zn and Cr in the original sample. [Hint, Cr is oxidized to the Cr III state.]

7) A mixture of K2SO4 and Na2SO4 weighing exactly 1.0 g was treated with excess aqueous silver nitrate. The resulting filtered dried precipitate weighed 1.992 g. What was the percent composition of the original mixture?

8) a 1.0g mixture of CuO and CuO2, when completely reduced, yields 0.839 g of Cu. What is the mass percent composition of the two oxides in the original sample?

9) When silver nitrate reacts with sodium chloride or potassium chloride, insoluble silver chloride is formed. A 1.0 g mixture of NaCI and KCI reacts with sliver nitrate to yield 2.15g of silver chloride. What was the mass percent composition of the original sample?

8. For the synthesis of ammonia from H2(g) and N2(g) by the reaction below, K = 6.2x10⁵ at 298 K and K = 9.06x10-² at 500 K.

3H2 (g) + N2 (g) ↔ 2NH3 (g)

The reaction is exothermic by 92.22 kJ/mole.
Suppose that hydrogen and nitrogen are reacted in the proper 3:1 stoichiometric ratio at 500K. If the initial pressure is 1 atm, what is the % yield of ammonia?

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