Ch. 11 & 3 IMF & stoichiometry test (85 points) AP Chem

Show you work in an organized manner, include any relevant equation / formula used, proper units in your work / answer, and the proper number of significant figures in your answer.

1. The Clausisus – Clapeyron equation is

K has a vapor pressure of 10.0 torr at 443 °C and 400.0 torr at 708 °C. [20 points]

a. determine ∆H vap

b. determine the boiling point (in °C).

2. What is the relative boiling point of H₂S versus SiH₄ ? Rationalize your answer. [10 points]

3. Sketch the vapor pressure versus temperature curve for propane and butane (label the curves & axis). Referring to this graph, which compound has [15 points]

a. the larger boiling point ?

b. the larger vapor pressure ?

c. using concepts involving IMF, justify the relative vapor pressure between these compounds.

 

4. The complete combustion of 1.0 g of a carboxylic acid produced 1.467 g CO₂ and 0.60 g water. The molar mass of the compound is 60.0 g / mole. [20 points]

a. determine its empirical formula

b. determine its chemical formula

5. CH₃NH₂ + O₂ -->  CO₂ + H₂O + N₂   [20 points]

a. write the balanced chemical equation

b. mixing 2.0 g methylamine and 4.0 g oxygen produces __ g water.

c. 2.0 g of water was formed by mixing 2.0 g methylamine and 4.0 g oxygen, what is the % yield of the reaction ?