A gas mixture contains 2 g of H₂ and 16 g of O₂. What is the total number of molecules? (Molar masses: H₂ = 2 g/mol, O₂
Moles of H₂ = 2/2 = 1 mol; moles of O₂ = 16/32 = 0.5 mol. Total moles = 1 + 0.5 = 1.5 mol. Molecules = 1.5 × 6.022 × 10²³ = 9.033 × 10²³.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Concentration Terms - Molarity Molality and Mole Fraction
