A diatomic molecule can be modelled as two rigid ball connected with spring such that the ball can vibrate with respect to centre of mass of the system (spring + balls). Consider a diatomic gas contain such diatomic molecule. If gas performs 20 Joule work under isobaric condition, then heat given to the gas (in Joule) is .
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Ans. 0140J
Sol. 
= 
⇒ Δ Q = 
. W
= 
× 20
= 140 J
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