1. Tardigrade
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  3. Chemistry
  4. In a system, a piston caused an expansion against an external pressure of 1.25 bar giving a change in volume of 32 L for which Δ E =-51 kJ . What was the value of heat involved:

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Q. In a system, a piston caused an expansion against an external pressure of 1.25 bar giving a change in volume of $32 L$ for which $\Delta E =-51 \,kJ .$ What was the value of heat involved:

Thermodynamics

Solution:

$W =- P _{\text {ext }} \Delta V$

$W =-1.25 \times 32=-40$ lt bar

$=-40 \times 100 J =-4000 J =-4 kJ$

$\Delta E = q + w$

So, $q =\Delta E - w =-51+4=-47 kJ$