A student dissolves 7.28 grams of a nonvolatile solid into 89.15 grams of diethyl ether. The vapor pressure of pure diethyl ether is 532 mmHg, while the vapor pressure of the solution is 528.15 mmHg. What is the molar mass (in g/mol) of the solid?

a. 829 g/mol

b. 191 g/mol

c. 955 g/mol

d. 1247 g/mol

e. 844 g/mol