Practice question

Given: How many molecules are in 12 g of CH₃OH? (Molar mass = 32 g/mol, Avogadro number = 6.022 × 10²³) These values define the system as per NCERT data. Formula: Moles = 12 / 32 = 0.375 mol. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Molecules = 0.375 × 6.022 × 10²³ ≈ 2.258 × 10²³. 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.