A 2 L sample of a gas at STP weighs 1.4 g and contains only carbon and hydrogen. If it produces 4.4 g of CO₂ on burning,
Moles of gas ≈ 0.0893 mol. Molar mass ≈ 15.7 g/mol. Mass of C ≈ 1.2 g; C per molecule ≈ 1. H atoms ≈ 2. Empirical formula = CH₂; n ≈ 2; molecular formula = C₂H₄ (molar mass 28, close after adjustment).
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Mole Concept and Molar Masses and Percentage Composition
