Question

which formula can be used to solve problems related to the first law of thermodynamics?
q = δw + u
q = u - δw
q = δu + w
q = δu - w

Explanation:

Step1: Recall first - law formula

The first law of thermodynamics states that the heat added to a system ($Q$) is equal to the change in the internal energy of the system ($\Delta U$) plus the work done by the system ($W$). So the formula is $Q=\Delta U + W$.

Answer:

C. $Q=\Delta U + W$