If 200 J of heat is added to a system and 50 J of work is done by the system, wh
Practice Questions
Q1
If 200 J of heat is added to a system and 50 J of work is done by the system, what is the change in internal energy? (2023)
150 J
250 J
200 J
100 J
Questions & Step-by-Step Solutions
If 200 J of heat is added to a system and 50 J of work is done by the system, what is the change in internal energy? (2023)
Step 1: Identify the amount of heat added to the system. In this case, it is 200 J.
Step 2: Identify the amount of work done by the system. Here, it is 50 J.
Step 3: Recall the formula from the first law of thermodynamics: ΔU = Q - W.
Step 4: Substitute the values into the formula: ΔU = 200 J - 50 J.
Step 5: Perform the subtraction: 200 J - 50 J = 150 J.
Step 6: Conclude that the change in internal energy (ΔU) is 150 J.
First Law of Thermodynamics – The principle that the change in internal energy (ΔU) of a system is equal to the heat added to the system (Q) minus the work done by the system (W).
