Practice question

Given: What is the mass percentage of magnesium in Mg(NO₃)₂? (Atomic masses: Mg = 24, N = 14, O = 16) These values define the system as per NCERT data. Formula: Molar mass = 24 + (2 × 14) + (6 × 16) = 24 + 28 + 96 = 148 g/mol. This is standard NCERT relation. Substitution & Calculation: Mass of Mg = 24 g. % Mg = (24 / 148) × 100 ≈ 16.22%. Result: The computed value matches expected outcome and confirms correct choice as per NCERT.