A volume of 0.285 L of a gas at STP weighs 0.537 g. Calculate the molar mass of the gas.

Answer 1

A mole of gas occupies 22.4 L at STP. So what's the mass of 22.4L of this gas?

Answer 2

so
(1)(.285)=(22.4)(273.15)
what do I do next?