Question

Question #6bbd8

Answer 1

You can use it for a monoatomic gas.

Explanation:

Because `U=(f/2)RT` and f=3 for monoatomic gases.
Yes you can use u-w=q for all processes. It is a basic equation just stating that the total energy of the system is conserved and it is true for all processes. But be careful to use the proper sign convention for both U and W.