NEET Solved Paper 2017 Question 31
Question: A gas mixture consists of 2 moles of $ O _2 $ and 4 moles of Ar at temperature T. Neglecting all vibrational modes, the total internal energy of the system is
Options:
A) $ 11,RT $
B) $ 4RT $
C) $ 15,RT $
D) $ 9,RT $
Show Answer
Answer:
Correct Answer: A
Solution:
- $ U=n _1\frac{f _1}{1}RT+n _2\frac{f _2}{2}RT $ $ =2\times \frac{5}{2}RT+4\times \frac{3}{2}RT $ $ =5RT+6RT $ $ U=11,RT $
