Practice question

Given: How many grams of O₂ are required to react with 14 g of N₂ to form N₂O₅? (Atomic masses: N = 14, O = 16) Formula: Moles of N₂ = 14 / 28 = 0.5 mol. Substitution & Calculation: Reaction: 2N₂ + 5O₂ -> 2N₂O₅ . . 2 mol N₂ require 5 mol O₂. Moles of O₂ = (5 / 2) × 0.5 = 1.25 mol. Mass = 1.25 × 32 = 40 g. Final Result: The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.