Question

(ii) Write the mathematical expression for the first law of thermodynamics. One mole of
an ideal gas is 35L. Calculate expanded isothermally against a constant pressure of 3
atmospheres from 10 litres to work done, change in internal energy and heat absorbed
during the process.



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Answer 1

Answer:

For ideal gas, ΔU=nCv

dT

For isothermal process, dT = 0

Hence, Change in internal energy(ΔE) is zero during isothermal expansion of a gas.