Question

A 2.5 litre flask contains 0.5 mole each of sulphur dioxide and nitrogen gas at 127° C. Calculate the pressure exerted by sulphur dioxide.

1. 6.65 × 10⁵ P_a
2. 2.49 × 10⁵ P_a
3. 9.14 × 10⁵ P_a
4. 7.2 × 10⁵ P_a

Answer 1

Correct Answer - Option 1 : 6.65 × 10⁵ P_a

From the Dalton’s Law

Partial pressure of SO₂

P_SO2 = nRT / V = 0.5 × 8.314 × 400 / 2.5 × 10^–3 = 6.65 × 10⁵ Nm^–2 = 6.65 × 10⁵ P_a

Similarly P_N2 = 2.49 × 10⁵ P_a