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CGP EDU Academic Team
Published on: August 14, 2026
In an isothermal expansion of one mole of an ideal gas against vacuum from 10 litre to 100 litre at 27°C, the quantity of heat absorbed by the gas is
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The quality of heat absorbed by the gas, Q = 
E + W, here W is the work done by the gas. For free expansion i.e., expansion against vacuum, W = 0; at constant temperature, the internal energy of an ideal gas is constant and so 
E = 0. Thus Q = 0.
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