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Q.

Two moles of oxygen gas is heated at constant pressure from 25°C to 75°C. The increase in internal energy of the gas in terms of gas constant R is

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a

100Rγ−1 joule 

b

75γRγ−1 joule 

c

25Rγ−1 joule 

d

75Rγ−1 joule 

answer is A.

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Detailed Solution

We know that 
CP=γR(γ−1)
Increase in internal energy
    du=2R(γ−1)[75−25]=100Rγ−1J

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