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Q.

Two flasks I and II shown below are connected by a valve of negligible volume. Question Image

When the valve is opened the final pressure of the system in bar is x× 10 −2  , The valve of x is _______(integer answer)

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answer is 84.

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Detailed Solution

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Assume the system attains a final temperature of T (such that300<T<60) 
 Heat lost by  N 2  of container  I =  Heat gained by  N 2  of container   II  ⇒ n 1 C m (300−I)= n I C m (T−60)  
⇒ 2.8 28 (300−T)= 0.2 28 (T−60)⇒T=284K (final temperature)   
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