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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoKTGMedium2 minQB

PhysicsMediumsingle choice

Sixty percent of a given sample of oxygen gas when raised to a high temperature dissociates into atoms. Ratio of its initial heat capacity (at constant volume) to the final heat capacity (at constant volume) will be

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Solution:

Take $1 mol_{2}$ : after dissociation, $0.4 mol O_{2} + 1.2 mol O$ .

$(C_{V})_{i} = \frac{5 R}{2} = 2.5 R; (C_{V})_{f} = 0.4 \times \frac{5 R}{2} + 1.2 \times \frac{3 R}{2} = R + 1.8 R = 2.8 R . Ratio = \frac{2.5}{2.8} = \frac{25}{28} .$

Stream:JEESubject:PhysicsTopic:Heat & ThermoSubtopic:KTG

⏱ 2mℹ️ Source: QB

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