Question

1. If you mix a 100 mL liquid solution containing equal parts by moles of benzene, toluene, ethyl-benzene, and o-xylene in a 1 L closed container, what's the partial pressure of toluene in the gas phase of the container? Given the vapor pressure of benzene, toluene, ethyl-benzene, and o-xylene are 12.7 kPa, 3.8 kPa, 0.88 kPa, and 1.27 kPa, respectively.

a) 0.95 kPa

b) 3.8 kPa

c) 4.7 kPa

d) 18.65 kPa

2. Given the pKa of acetic acid (CH₃COOH) is 4.75, at a H+ concentration of 17.8 x 10^-6 M, what is the concentration of CH₃COO^- in the solution if 10 millimoles of acetic acid was added to 100 mL?

a) 5 mM

b) 10 mM

c) 50 mM

d) 100 mM

Answer 1