A certain mass of an ideal gas at 9 atm and 30°C is first heated to 131°C at constant volume and then the amount of the gas is increased by 50% at constant volume and temperature. The final pressure o

Question

A certain mass of an ideal gas at 9 atm and 30°C is first heated to 131°C at constant volume and then the amount of the gas is increased by 50% at constant volume and temperature. The final pressure of the gas becomes [3]

Prashant Kotian · Accepted Answer

Correct answer: C. Step 1 (constant volume heating): P1/T1 = P2/T2 => 9/303 = P2/404 => P2 = 12 atm. Step 2 (adding 50% gas at constant V and T): Pressure is directly ∝ moles, so P3 = 1.5 * P2 = 1.5 * 12 = 18 atm. [3]

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