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JEE Main & Advanced Sample Paper JEE Main Sample Paper-23

  • question_answer
    An ideal gas expands from \[1.5\] to \[6.5\] litre against as constant pressure of \[0.5\] atm and during this process the gas also absorbs 100J of heat. The change in the internal energy of the gas is-

    A)  \[153.3\] J                    

    B)  \[353.3\] J

    C)  \[-153.3\]J                                

    D)  \[-353.3\] J

    Correct Answer: C

    Solution :

    \[w=-{{P}_{ext}}\,({{v}_{2}}-{{v}_{1}})\] \[=-0.5\,(6.5\,-1.4)\,\times 1013\] \[=-\frac{1013}{4}\] \[=-253.3\] \[\Delta U=Q+W\] \[=+100-253.3\] \[=-153.3J\]


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