If $2 \mathrm{~kJ}$ of heat is released from system and $6 \mathrm{~kJ}$ of work is done on the system, what…

If $2 \mathrm{~kJ}$ of heat is released from system and $6 \mathrm{~kJ}$ of work is done on the system, what is enthalpy change of system?
  1. $+8 \mathrm{k}$
  2. $+6 \mathrm{k} \mathrm{J}$
  3. $-8 \mathrm{k}]$
  4. $-2 \mathrm{k} \mathrm{J}$

Solution

$Q=-2 \mathrm{~kJ}, \quad W=+6 \mathrm{~kJ}$ $\therefore \quad \Delta U=Q+W=-2+6=4 \mathrm{~kJ}$ Now, $\Delta H=\Delta U-W=4-6=-2 k J$

Asked in: MHT CET 2020 (19 Oct Shift 1)

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