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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoThermodynamicsMedium2 minQB

PhysicsMediumsingle choice

How much heat must be supplied to a mixture of 10 gm hydrogen and 40 gm of He to increase the temperature by 50° if they are kept in a closed vessel?

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Answer:

Solution:

Closed vessel ⇒ constant volume: $Q = \sum n C_{V} Δ T$ .

$n_{H_{2}} = \frac{10}{2} = 5 mol, C_{V} = \frac{5 R}{2}; n_{He} = \frac{40}{4} = 10 mol, C_{V} = \frac{3 R}{2} . Q = (5 \times \frac{5 R}{2} + 10 \times \frac{3 R}{2}) \times 50 = 27.5 R \times 50 = 1375 R .$

With $R = 2 cal / mol - K : Q = 2750 cal$ .

Stream:JEESubject:PhysicsTopic:Heat & ThermoSubtopic:Thermodynamics

⏱ 2mℹ️ Source: QB

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