First slide

Fundamentals of thermodynamics

Question

The work done to contract a gas in a cylinder, is 462 joules. 128 joule energy is evolved in the process. What will be the internal energy change in the process

Moderate

A

$+ 590 joules$
B

$-334 joules$
C

$+ 334 joules$
D

$- 590 joules$

Solution

As the work is done on system, it will be positive i.e. $W = + 462 joule, q = - 128 joule$ (heat is evolving) From the $1^{s t}$ law of thermodynamics
$Δ E = q + w = (- 128) + (+ 462) = + 334 Joules.$

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