Question

A gas is compressed from 5 L to 3 L under an average pressure of 200000 Pa. During the compression 0.3 kJ of heat is given off. The internal energy of the gas

Answer 1

Solution

For an isobaric process workdone

W = P(V₂ - V₁).

$W=200000\times(0.003-0.005)$

$W=-400J$

$\Delta Q=300J$

Energy conservation: ΔU = ΔQ - ΔW.

ΔU = 300-(-400) =700J