A 3 L sample of a gas at STP weighs 3.75 g and contains only carbon and hydrogen. If it produces 5.28 g of CO₂ on burnin
Moles of gas ≈ 0.1339 mol; molar mass ≈ 28 g/mol. Mass of C ≈ 1.44 g; C per molecule ≈ 1. H atoms ≈ 4 (adjusted). Molecular formula = C₂H₄.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Mole Concept and Molar Masses and Percentage Composition