During an isothermal expansion, a confined ideal gas does 150 ~J of work against its surroundings. This implies that

Correct answer: C. 150 ~J of heat has been added to the gas By first law of thermodynamics - aligned dQ& =dV+dW dV& =0 for isothermal process dQ& =dW & =+150 aligned 150 J of heat has been added to the system. So, the correct answer is ' 150 J of heat has been added to the gas'.

NEET 2011

Exam: NEET
Year: 2011
Subject: Physics
Chapter: Thermodynamics

NEET 2011 · Physics · Thermodynamics

During an isothermal expansion, a confined ideal gas does 150 ~J of...

During an isothermal expansion, a confined ideal gas does

150 \mathrm{~J}

of work against its surroundings. This implies that

Options

A $300 \mathrm{~J}$ of heat has been added to the gas
Bno heat is transferred because the process is is othermal
C $150 \mathrm{~J}$ of heat has been added to the gas
D $150 \mathrm{~J}$ of heat has been removed from the gas

Correct answer

C. $150 \mathrm{~J}$ of heat has been added to the gas

Step-by-step solution

By first law of thermodynamics -

\begin{aligned}\mathrm{dQ}& =\mathrm{dV}+\mathrm{dW}\\ \mathrm{dV}& =0 \text{ for isothermal process }\\ \mathrm{dQ}& =\mathrm{dW}\\ & =+150 \end{aligned}

\Rightarrow 150 \mathrm{ J}

of heat has been added to the system. So, the correct answer is '

150 \mathrm{ J} of heat has been added to the gas'.

Practice Thermodynamics on Quantrex Academy →

More from Thermodynamics