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What is the work done for an ideal gas isothermal process?

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What is the work done for an ideal gas isothermal process?

(a) Zero

(b) Equal to heat transferred

(c) Equal to change in internal energy

(d) Cannot say

The question was posed to me during an online interview.

Query is from Simplifications of General Energy Balance topic in division Application of Energy Balances in the Absence of Chemical Reactions and Energy Balances: How to Account for Chemical Reaction of Basic Chemical Engineering

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The correct choice is (b) Equal to heat transferred

The explanation is: For ideal gas isothermal process ∆U = 0, => Work done is equal to heat transferred.

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