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Problem 3 - Olympiad

What is the speed of sound in a gas with molar mass 32 g/mol at 27°C? (γ = 1.4, R = 8.314 J/mol·K)

Correct: A

Use v = sqrt(γRT/M). Convert 27°C to 300 K and M to 0.032 kg/mol. v ≈ sqrt(1.4 * 8.314 * 300 / 0.032) ≈ 347 m/s.