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For which reaction will DeltaH-DeltaE=0?...

For which reaction will `DeltaH-DeltaE=0?` Assume that each reaction is carried out in an open container.

A

`2CO(g)+O_(2)(g) to 2CO_(2)(g)`

B

`PCl_(5)(g) to PCl_(3)(g)+Cl_(2)(g)`

C

`H_(2)(g)+Br_(2)(g) to 2HBr(g)`

D

`C(s)+2H_(2)O(g) to 2H_(2)(g)+CO_(2)(g)`

Text Solution

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The correct Answer is:
C
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Chemical reactions are invariably associated with the transfter of energy either in the form of heat or light. In the laboratory, heat changes in physical and chemical processes are measured with an instrument called calorimeter. Heat change in the process is calculated as {:(q = ms DeltaT,,s =Specific heat),(=cDeltaT,,c =Heat capacity):} Heat of reaction at constant volume is measured using bomb calorimeter. q_(V) = DeltaU = Internal energy change Heat of reaction at constant pressure is measured using simple or water calorimeter. q_(p) = DeltaH q_(p) = q_(V) +P DeltaV DeltaH = DeltaU +DeltanRT For which reaction will DeltaH = DeltaU ? Assume each reaction is carried out in an open container.

Equilibrium state can be achieved if a reversible reaction is carried out in closed or open container.

Knowledge Check

  • For which reaction DeltaH=DeltaU ?

    A
    `PCl_(5(g))rarr PCl_(3(g))+Cl_(2(g))`
    B
    `2CO_((g))+O_(2(g))rarr 2CO_(2(g))`
    C
    `H_(2(g))+Br_(2(g))rarr 2HBr_((g))`
    D
    `C_((s))+2H_(2)O_((g)) rarr 2H_(2(g))+CO_(2(g))`

  • When a reaction is carried out in a closed vessel.

    A
    `q_(p) lt q_(v)`
    B
    `q_(p) gt q_(v)`
    C
    `q_(p) = q_(v)`
    D
    `q_(v) = 0`

  • Calculate the work done when 112 g iron reacts with dilute HCl at 300 K. The reaction is carried out in an open container (At mass of Fe = 56)

    A
    600 cal
    B
    300 cal
    C
    200 cal
    D
    -1200 cal

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