JEE Main 2026 Chemistry question
Complete combustion of X g of an organic compound gave 0.25 g of CO₂ and 0.12 g of H₂O. If the % of carbon is 25% and of hydrogen is 4.89%, then X = × 10⁻³ g. (Nearest integer) (Molar mass of C, H and O are 12, 1 and 16 g mol⁻¹ respectively.)
Answer: 273
Solution
Mass of C = 0.25 × 12/44 = 0.0682 g, which is 25% of X: X = 0.0682/0.25 = 0.2727 g = 273 × 10⁻³ g.