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VMMC VMMC Medical Solved Paper-2015

  • question_answer
    One mole of an ideal gas with \[{{C}_{v}}=\frac{3}{2}R\]is heated at a constant presure of 1 atm from 25°C to 100°C. The \[\Delta E\] and \[\Delta H\]respectively are

    A) 300,225                

    B) 225,375

    C) 375, 225               

    D) 225, 300

    Correct Answer: B

    Solution :

    For ideal gas, \[\Delta E=n{{C}_{v}}.\Delta T=1\times \left( \frac{3}{2}\times 2 \right)\times (100-25)=225cal\]Now,\[{{C}_{p}}={{C}_{v}}+R=\frac{3}{2}R+R=\frac{5}{2}R\] \[\Delta E=n{{C}_{p}}\Delta T=1\times \left( \frac{5}{2}\times 2 \right)\times (100-25)=375cal\]


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