Q27 / 150 · MHT CET 2021 (23 Sep Shift 1) · Chemistry

In a process, a system performs $238 \mathrm{~J}$ of work on it's surrounding by absorbing $54 \mathrm{~J}$ of heat. What is the change in internal energy of system during this operation?

  • A
    222 J
  • B
    -192 J
  • C
    54 J
  • Correct answer
    D
    -184 J

Solution

Heat absorbed by the system is $(+)$ ve. Work done by the system is (-) ve. $$ \begin{aligned} & \mathrm{W}=-238 \mathrm{~J} \\ & \mathrm{q}=+54 \mathrm{~J} \\ & \Delta \mathrm{U}=\mathrm{q}+\mathrm{w} \\ & =54-238 \\ & =-184 \mathrm{~J} \end{aligned} $$

Hence, the correct answer is option: 'D'.

Relevant Questions