MHT CET · Chemistry · Thermodynamics (C)
During a process, system absorbs \(710 \mathrm{~J}\) of heat and increases the internal energy by \(460 \mathrm{~J}\). What is the work performed by system?
- A -250 J
- B -1170 J
- C -710 J
- D -460 J
Answer & Solution
Correct Answer
(A) -250 J
Step-by-step Solution
Detailed explanation
\(
\begin{aligned}
& \mathrm{q}=+710 \mathrm{~J} \\
& \Delta \mathrm{U}=460 \mathrm{~J}
\end{aligned}
\)
From Ist law of thermodynamics,
\(
\begin{aligned}
& \Delta \mathrm{U}=\mathrm{q}+\mathrm{w} \\
& 460=710+\mathrm{w} \\
& \mathrm{w}=460-710 \\
& =-250 \mathrm{~J}
\end{aligned}
\)
\begin{aligned}
& \mathrm{q}=+710 \mathrm{~J} \\
& \Delta \mathrm{U}=460 \mathrm{~J}
\end{aligned}
\)
From Ist law of thermodynamics,
\(
\begin{aligned}
& \Delta \mathrm{U}=\mathrm{q}+\mathrm{w} \\
& 460=710+\mathrm{w} \\
& \mathrm{w}=460-710 \\
& =-250 \mathrm{~J}
\end{aligned}
\)
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