Calculate $\Delta \mathrm{U}$ if $2 \mathrm{~kJ}$ heat is released and $10 \mathrm{~kJ}$ of work is done on…

Calculate $\Delta \mathrm{U}$ if $2 \mathrm{~kJ}$ heat is released and $10 \mathrm{~kJ}$ of work is done on the system.
  1. $20 \mathrm{~kJ}$
  2. $12 \mathrm{~kJ}$
  3. $8 \mathrm{~kJ}$
  4. $5 \mathrm{~kJ}$

Solution

From $\mathrm{I}^{\text {st }}$ law of thermodynamics $\begin{aligned} & \Delta \mathrm{E}=\partial \mathrm{Q}+\partial \mathrm{W} \\ & =-2+10 \\ & =8 \mathrm{KJ}\end{aligned}$

Asked in: MHT CET 2022 (05 Aug Shift 2)

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