A sample of gas absorbs $4000 \mathrm{~kJ}$ of heat and surrounding does $2000 \mathrm{~J}$ of work on…

A sample of gas absorbs $4000 \mathrm{~kJ}$ of heat and surrounding does $2000 \mathrm{~J}$ of work on sample. What is the value of $\Delta \mathrm{U}$ ?
  1. $2000 \mathrm{kJ}$
  2. $4002 \mathrm{kJ}$
  3. $4000 \mathrm{kJ}$
  4. $6000 \mathrm{kJ}$

Solution

$Q=+4000 \mathrm{~kJ}, \mathrm{~W}=+2000 \mathrm{~J}=+2 \mathrm{~kJ}$ $\Delta U=Q+W=4000+2=4002 \mathrm{~kJ}$

Asked in: MHT CET 2020 (16 Oct Shift 1)

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