Question

PLEASE HELP!!!!!!!!!!! Dx

In a gasoline engine's cylinder 61.0 J of work is done by the gas and 133 J is removed from the gas as heat. What is the change of the internal energy of the gas?

Answer 1

61+ 133

Answer 2

61 j to push the piston 133 lost to heat

Answer 3

Let's consider the cylinder as a closed system. Positive work is work done on the environment in this case and positive heat is heat added to the system.

Let's set up our first law expression\[W - Q = \Delta E\]We have positive work and negative heat, therefore\[61 + 133 = \Delta E\]