A gas occupies 5.6 L at STP and weighs 8 g. What is its molar mass?
Moles = 5.6/22.4 = 0.25 mol. Molar mass = 8/0.25 = 32 g/mol.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Stoichiometry and Stoichiometric Calculations and Limiting Reagent