Question

A system undergoes a process which absorbed 5 kj of heat and undergoing an expansion against external pressure of 1 atm, during the process change in internal energy is 300 j. Then predict the change in volume (lit

Answer 1

The change in volume is 2 liter.

Given-

• Heat absorbed by the system = 5 kJ
• External pressure = 1 atm
• Change in internal energy is = 300 J

From the first law of thermodynamics

ΔU = Q + W in which ΔU is the change in internal energy, Q is the heat and W is the work done.

ΔU = Q - P ext (V₂ - V₁)

By substituting the values we get

300 = 500 - 1 (ΔV) × 100

ΔV = 2 lit

Hence the change in volume is 2 liter.