Question

iii)
Calculate the change in internal energy
when a gas is expanded by supplying
1500 J of heat energy. Work done in
expansion is 850 J.?​

Answer 1

Explanation:

Q=W+∆U

1500 = 850+ ∆U

∆U = 650J

Answer 2

Answer:

The change in the internal energy is 650 J

Explanation:

Given: Gas is expanded by supplying 1500 J of heat energy.

To find: Work done in expansion is 850 J

Solution:

Gas in the form of heat energy,

Q = 1500  J W

Given that work done in expansion = 850 J

W= -850 J

(For expansion work is negative)

Δu = ?

By first law of thermodynamics,

According to the First Law of Thermodynamics, energy can only be changed from one form to another and cannot be generated or destroyed.

Δu = Q + W

Δu  = 1500 + (-850)

= 650 J

Change in internal energy

Δu = 650 J

Final answer:

The change in the internal energy is 650 J

SPJ3