Practice question

Given: What is the mass percentage of sulfur in Na₂S? (Atomic masses: Na = 23, S = 32) Formula: Molar mass = (2 × 23) + 32 = 46 + 32 = 78 g/mol. Substitution & Calculation: Mass of S = 32 g. % S = (32 / 78) × 100 ≈ 41.03%. Final Result: The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.