A gas occupies 4.48 L at STP and weighs 6.4 g. What is its molar mass?
Moles = 4.48/22.4 = 0.2 mol. Molar mass = 6.4/0.2 = 32 g/mol.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Laws of Chemical Combination - Conservation Mass Definite Multiple