A cylinder contains 0.15 kg of hydrogen. It is closed by a piston supporting a weight of 74 kg (figure). What amount of heat must be supplied to lift the weight by 0.6 m? Assume the process is isobaric and that the heat capacity of the vessel and the external pressure are negligible.

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TestHub · Accepted Answer

Work done lifting the weight: W = m g h = 74 × 9.8 × 0.6 = 435.1 J. Hydrogen is diatomic, so C p ​ = 2 7 ​ R and W Q ​ = R C p ​ ​ = 2 7 ​ . Q = 3.5 × 435.1 = 1523 J.

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