2. Questions Bank
  3. JEE Main & Advanced
  4. Chemistry
  5. Thermodynamics / रासायनिक उष्मागतिकी

JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank Mock Test - Chemical Thermodynamics

  • question_answer
    Evaluate \[\Delta U\] at 500 K for the process \[Mg(s)+2HCl(g)\to MgC{{l}_{2}}(s)+{{H}_{2}}(g)\Delta H=-109\]kcal The volume change of solids to be ignored

    A) -204 kcal

    B) -108 kcal

    C)  -9 kcal  

    D) +9 kcal

    Correct Answer: B

    Solution :

    [b] \[\Delta H=\Delta U+\Delta {{n}_{g}}RT\] \[-109=\Delta U+\left( \frac{-1\times 2\times 500}{1000} \right)kcal\] \[-109=\Delta U-1\,kcal\] \[\Delta U=-109+1=-108\,kcal\]


You need to login to perform this action.
You will be redirected in 3 sec spinner