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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoThermodynamics Laws & Specific Heats of GasesMedium2 minQB

PhysicsMediuminteger

Three moles of an ideal gas at 400 K are cooled isochorically so that the pressure falls 2.5 times. Then the gas expands isobarically until its temperature is back to 400 K. Find the total heat absorbed in joules (nearest integer).

Answer:

5986

Solution:

$Δ U = 0$ , so $Q = W = n R Δ T$ for the isobaric step. After the isochoric step $T = 160$ K, so $Δ T = 240$ K and $Q = 3 \times 8.314 \times 240 = 5986$ J.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Thermodynamics Laws & Specific Heats of Gases

⏱ 2mℹ️ Source: QB

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