For a gas at a fixed temperature, if the work done on or by the system is zero, then the change in the gas’s internal energy equals?

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1. For a gas at a fixed temperature, if the work done on or by the system is zero, then the change in the gas’s internal energy equals?

The heat that flows into or out of the system

Less than the heat transferred

More than the heat transferred

This cannot be determined at all

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With zero work done, the First Law of Thermodynamics simplifies to change in internal energy equals heat transferred, since no energy leaves or enters as mechanical work.