First slide

First law of thermodynamics

Question

Consider the following statements :
A) Heat given to an ideal gas under isothermal conditions is used completely to do external work.
B) The change in internal energy in a thermodynamic process is independent of the path.

Easy

Solution

In an isothermal process. Temperature is constant.
$\large So\,\Delta U\, = \,0$
From 1^st law $\large Q\, = \,\Delta U\, + w$
Internal energy of a gas depends upon temperature of gas and is independent of the path taken

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