Question

Net heat released by the system if initial and final temperatures of a gas is same and work done is $35kJ$ is

• A. positive
• B. negative
• C. zero
• D. cannot be decided with given information

Answer 1

The correct option is B negative

From 1st Law,
$dQ=dU+dW$
Since initial and final temps are same, $dU=0$
Given,
$dW=-35J$
$\therefore$ $dQ=0-35J=-35J$
$\therefore$ $35$ J heat is released by the system.