Practice question

Given: A compound has an empirical formula CH₂ and a molar mass of 70 g/mol. What is its molecular formula? (Atomic masses: C = 12, H = 1) These values define the system as per NCERT data. Formula: Empirical mass = 12 + (2 × 1) = 14 g/mol. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: n = 70 / 14 = 5. Molecular formula = C₅H₁₀. 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.