NEET2017Chemistry-Thermodynamics
NEET 2017 Chemistry First Law of Thermodynamics MCQ Question
Type: MCQ-numerical-Hard-Class 11
A gas is allowed to expand in a well-insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy (ΔU) of the gas in joules will be
A
1136.25 J
B
-500 J
C
-505 J
D
+505 J
Correct Answer
Option C
Detailed Explanation
The work done by the gas is given by W = -PΔV. Since the process is adiabatic (well-insulated), ΔU = W. Converting atm L to joules gives the answer.
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