Question
Chemistry Question on Thermodynamics
When 1 mol gas is heated at constant volume temp. is raised from 298 to 308 K. Heat supplied to the gas is 500 J. Then which statement is correct : -
A
q = w = 500 J, ∆U = 0
B
q = ∆U = 500J, w = 0
C
q = w = 500 J, ∆U = 0
D
∆U = 0, q = w = – 500 J
Answer
q = ∆U = 500J, w = 0
Explanation
Solution
The correct options is(B): q = ΔU = 500 J, w = 0. This is because, in a process conducted at constant volume (isochoric process), no work is done (w = 0), and the heat added to the system (q) directly contributes to the change in internal energy (ΔU) of the gas.