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JEE Main & Advanced Physics Thermodynamical Processes Question Bank Self Evaluation Test - Thermodynamics

  • question_answer
      4 kg of oxygen gas is heated so as to raise its temperature from 20 to\[120{}^\circ C\]. If the heating is done at constant pressure, the external work done by the gas is (\[{{C}_{p}}=0.219cal/g{}^\circ C\] and )

    A) 628 kJ  

    B)        104 kJ  

    C) 366 kJ  

    D)        206 kJ

    Correct Answer: B

    Solution :

    [b] \[W=P(\Delta V)-P\left( {{V}_{\gamma }}\Delta T \right)\] \[={{10}^{5}}\times {{\left( 5\times {{10}^{-2}} \right)}^{3}}\times 3.5\times {{10}^{-5}}\times 375=0.164J\] \[=4\left( 0.219-0.157 \right)\times 4200\times \left( 120-20 \right)\]\[=104\times {{10}^{3}}J\]


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