Question

For a gaseous system find change in internal energy if the heat supplied to the system is 50 J and work done by the system is 16 J.

Answer 1

Answer:

change in internal energy is 34 joules

Explanation:

from first law of thermodynamics

dq=du+dw.

50j=du+16j

du=34j

Answer 2

Answer:

Change in internal energy of the system, ΔU, is 34 J.

Explanation:

Given,

For a gaseous system,

• Heat provided to the system, Q = 50 J

• Work done by the system, W = +16 J

As word done by the system is taken as positive in physics.

• Change in internal energy of the system, ΔU = ?

As we know,

• The first law of thermodynamics is based on the principle of conservation of energy. It states that total energy of a system remains constant, it energy can be transformed from one form to another form, but can neither be created nor be destroyed.

So, according to the first law of thermodynamics,

• ΔU = Q - W
• ΔU = 50 - 16
• ΔU = 34 J

RESULT: For a gaseous system, if the heat supplied to the system is 50 J and work done by the system is 16 J, then the change in internal energy is 34 J.