First slide

First law of thermo dynamics

Question

A gas absorbs 250 J of heat and expands from 1 litre to 10 litre at constant temperature against external pressure of 0.5 atm. The values of q, w and Δ E will be respectively.

Easy

Solution

W = -PΔV = - 0.5(10-1) =-4.5 lit-atm
= 4.5x101.3 = -455J
q = +250J
ΔE = q+W = 250 - 455
= -205J

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