Question

∆U = q - p∆V. If the process is carried out at constant volume, then ∆V=0. Answer the following questions. 

1. Give the equation for ∆U. 

2. 1000J was supplied to a system at constant volume. It resulted in the increase of temperature of the system from 45 °C to 50 °C. Calculate the change in internal energy.

Answer 1

1. ∆U = q_v

2. Since the volume kept constant, ∆V=0 

∴ ∆U = q_v = 1000J