Practice question

Given: A gas mixture contains 4 g of helium and 32 g of oxygen. What is the total pressure if the volume is 22.4 litres at 273 K? (R = 8.31 J mol^{-1 K^{-1) These values define the system as per NCERT data. Formula: μ_{He = 4/4 = 1 mol, μ_{O_2 = 32/32 = 1 mol. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Total moles = 1 + 1 = 2 mol, V = 22.4 × 10⁻³ m³. P = μ R T/V = frac2 × 8.31 × 27322.4 × 10⁻³= 2.02 × 10⁵ Pa approx 2 atm . 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.