Question: If a gas expands and does 150 J of work while absorbing 100 J of heat, what is the change in internal energy?
Options:
-50 J
50 J
250 J
100 J
Correct Answer: -50 J
Solution:
Using the first law of thermodynamics, ΔU = Q - W = 100 J - 150 J = -50 J.
If a gas expands and does 150 J of work while absorbing 100 J of heat, what is t
Practice Questions
Q1
If a gas expands and does 150 J of work while absorbing 100 J of heat, what is the change in internal energy?
-50 J
50 J
250 J
100 J
Questions & Step-by-Step Solutions
If a gas expands and does 150 J of work while absorbing 100 J of heat, what is the change in internal energy?
Step 1: Identify the values given in the problem. The work done by the gas (W) is 150 J and the heat absorbed by the gas (Q) is 100 J.
Step 2: Recall the formula from the first law of thermodynamics, which states that the change in internal energy (ΔU) is equal to the heat absorbed (Q) minus the work done (W).
Step 3: Substitute the values into the formula: ΔU = Q - W = 100 J - 150 J.
Step 4: Perform the calculation: 100 J - 150 J equals -50 J.
Step 5: Conclude that the change in internal energy (ΔU) is -50 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).
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