Question:
A gas absorbs 18 J of heat and work done on the gas is 12 J. Then the change in internal energy of the gas is:
A gas absorbs 18 J of heat and work done on the gas is 12 J. Then the change in internal energy of the gas is:
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The internal energy change of a system is determined using the first law of thermodynamics, which considers heat and work interactions.
Updated On: Mar 13, 2025
- \( 24 \) J
- \( 36 \) J
- \( 6 \) J
- \( 30 \) J
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The Correct Option is D
Solution and Explanation
Step 1: Apply First Law of Thermodynamics
The first law of thermodynamics states:
\[
\Delta U = Q + W
\]
where \( Q \) is the heat absorbed by the system and \( W \) is the work done on the system.
Step 2: Substitute Given Values Given \( Q = 18 \) J and \( W = 12 \) J: \[ \Delta U = 18 + 12 = 30 \text{ J} \]
Step 2: Substitute Given Values Given \( Q = 18 \) J and \( W = 12 \) J: \[ \Delta U = 18 + 12 = 30 \text{ J} \]
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