A gas with a fixed number of molecules does 15 J of work on its surroundings, and 30 J of heat are transferred from the gas to the surroundings. What happens to the internal energy of the gas?

It decreases by 45 J.

It decreases by 15 J.

It remains the same.

It increases by 15 J.

It increases by 45 J.

Question

A gas with a fixed number of molecules does 15 J of work on its surroundings, and 30 J of heat are transferred from the gas to the surroundings. What happens to the internal energy of the gas?

It decreases by 45 J.
		
It decreases by 15 J.
		
It remains the same.
		
It increases by 15 J.
		
It increases by 45 J.

anonymous · Answer

The answer is...









First law of thermodynamics :D .. So.. what is the first law buddy?