Question

A gas occupies 2 lit at stp provides 300 joule heat so that it's volume become 2.5lit calculate change in internal energy?​

Answer 1

ΔU = q + W

W = -PΔV         (work of expansion)

or, W = -1 (2.5 - 2) = 0.5 litre-atm

         = -0.5 x 101.3 J  

        = -50.65 J

q= 300 J

Therefore, ΔU = 300 J + (-50.65 J)

                      = 249.35 J

Answer 2

Explanation:

Dear User,

ΔU = q + W

W = -PΔV (work of expansion)

or, W = -1 (2.5 - 2) = 0.5 litre-atm

= -0.5 x 101.3 J

= -50.65 J

q= 300 J

Therefore, ΔU = 300 J + (-50.65 J)

= 249.35 J