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JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank First law of thermodynamics and Hess law

  • question_answer
    An ideal gas expands in volume from \[1\times {{10}^{-3}}{{m}^{3}}\] to \[1\times {{10}^{-2}}{{m}^{3}}\] at 300 K against a constant pressure of \[1\times {{10}^{5}}N{{m}^{-2}}\]. The work done is          [AIEEE 2004]

    A)                 270 kJ   

    B)                 ?900 kJ

    C)                 ?900 J   

    D)                 900 kJ

    Correct Answer: C

    Solution :

               \[W=-P\Delta V\] \[=-1\times {{10}^{5}}\,(1\times {{10}^{-2}}-1\times {{10}^{-3}})\]                                 \[=-1\times {{10}^{5}}\times 9\times {{10}^{-3}}=-900\,J\]


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