When 4.00 kj of energy is transferred as heat to nitrogen in a cylinder fitted with a piston at an external pressure of 3.00 atm, the nitrogen gas expands from 1.00 to 4.00 l against this constant pressure. what is u for the process?

1. -4.91 kj
2. -0.912 kj
3. +3.09 kj
4. 0
5. +4.91 k

3. +3.09 kJ

Explanation:

The change in internal energy of the gas is given by the 1st law of thermodynamics:

where

Q is the heat transferred to the gas

W is the work done by the gas

Here we have:

is the amount of heat transferred to the nitrogen

is the pressure of the gas

is the change in volume of the gas

So the work done by the gas is

So, the change in internal energy of the gas is

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