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If a gas expands and does 50 J of work while absorbing 30 J of heat, what is the
If a gas expands and does 50 J of work while absorbing 30 J of heat, what is the change in internal energy?
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Practice Questions
1 question
Q1
If a gas expands and does 50 J of work while absorbing 30 J of heat, what is the change in internal energy?
-20 J
20 J
80 J
30 J
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Using the First Law of Thermodynamics, ΔU = Q - W. Here, ΔU = 30 J - 50 J = -20 J.
Questions & Step-by-step Solutions
1 item
Q
Q: If a gas expands and does 50 J of work while absorbing 30 J of heat, what is the change in internal energy?
Solution:
Using the First Law of Thermodynamics, ΔU = Q - W. Here, ΔU = 30 J - 50 J = -20 J.
Steps: 5
Show Steps
Step 1: Identify the values given in the problem. The work done by the gas (W) is 50 J, and the heat absorbed by the gas (Q) is 30 J.
Step 2: Recall the formula from the First Law of Thermodynamics, which is ΔU = Q - W. This formula helps us find the change in internal energy (ΔU).
Step 3: Substitute the values into the formula. Here, Q is 30 J and W is 50 J, so we write ΔU = 30 J - 50 J.
Step 4: Perform the calculation. 30 J - 50 J equals -20 J.
Step 5: Conclude that the change in internal energy (ΔU) is -20 J.
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