Practice question

Given: How many grams of O₂ are produced from 49 g of H₂O₂ in the reaction 2H₂O₂ -> 2H₂O + O₂ ? (Atomic masses: H = 1, O = 16) These values define the system as per NCERT data. Formula: Molar mass of H₂O₂ = 34 g/mol. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Moles of H₂O₂ = 49 / 34 ≈ 1.441 mol. 2 mol H₂O₂ produce 1 mol O₂. Moles of O₂ = 1.441 / 2 ≈ 0.7205 mol. Mass = 0.7205 × 32 ≈ 23.06 g ≈ 23 g. Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.