What is the change in internal energy (ΔU)of the system if q = -8 kJ and w = -1 kJ for a certain process?
A)-9 kJ
B)-7 kJ
C)7 kJ
D)9 kJ
E)-8 kJ

Question

Quizplus · Accepted Answer

The first law of thermodynamics states that the change in internal energy (ΔU) of a system is equal to the heat transferred (q) minus the work done (w) on the system. Therefore, ΔU = q + w. Substituting the given values, we get ΔU = -8 kJ + (-1 kJ) = -9 kJ. Therefore, the correct answer is (A) -9 kJ.

What Is the Change in Internal Energy (ΔU)of the System