If the addition of 41.4 g of a nonvolatile solute to 2.26 mol of benzene lowers the vapor pressure from 106.2 torr to 95.2 torr, what is the molar mass of the solute?
a) 126.50 g/mol
b) 78.24 g/mol
c) 58.44 g/mol
d) 92.40 g/mol