Question

In the determination of the molar mass of a volatile liguid a 250ml flask was found to contain 0.250g of the vapor measured at 273c and 760 mmhg pressure. The molar mass is nearest the value

Answer 1

Use PV = nRT and solve for n = number of mols. Then n = grams/molar mass. You know grams and moles, solve for molar mass.