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For which of the following reactions, \Delta H is equal to \Delta U ?

  • Option 1)

    N_{2}(g)+3H_{2}(g)\rightarrow 2NH_{3}(g)

     

     

     

  • Option 2)

    2HI(g)\rightarrow H_{2}(g)+I_{2}(g)

  • Option 3)

    2NO_{2}(g)\rightarrow N_{2}O_{4}(g)

  • Option 4)

    2SO_{2}(g)+O_{2}(g)\rightarrow 2SO_{3}(g)

 

Answers (1)

best_answer

 

As we learned

Molar heat capacity for isobaric process C(p) -

dH=n\: C_{P}\: dT
 

- wherein

dH=dE+d(PV)

or

dH=dE+n\, R\, dT

 

 \Delta H= \Delta U+\Delta ngRT

2HI(g)\rightarrow H_{2}(g)+I_{2}(g); \Delta ng=(1H)-2=0

Therefore ; \Delta H= \Delta U


Option 1)

N_{2}(g)+3H_{2}(g)\rightarrow 2NH_{3}(g)

 

 

 

Option 2)

2HI(g)\rightarrow H_{2}(g)+I_{2}(g)

Option 3)

2NO_{2}(g)\rightarrow N_{2}O_{4}(g)

Option 4)

2SO_{2}(g)+O_{2}(g)\rightarrow 2SO_{3}(g)

Posted by

prateek

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