Question

A gas is compressed at a constant pressure of 50 N/m² from a volume of 10 m³ to a volume of 4 m³. Energy of 100 J is then added to the gas by heating. Its internal energy is ______.

Options

• Increased by 400 J

• Increased by 200 J

• Increased by 100 J

• Decreased by 200 J

Answer 1

A gas is compressed at a constant pressure of 50 N/m² from a volume of 10 m³ to a volume of 4 m³. Energy of 100 J is then added to the gas by heating. Its internal energy is Increased by 400 J.

Explanation:

ΔU = ΔQ – ΔW

Now, ΔW = PΔV

= 50 [4 – 10] = –300 J

ΔQ = 100 J

So ΔU = 400 J increased.