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At 298 K, the heats of formation fo C Cl...

At 298 K, the heats of formation fo `C Cl_(4) (g), H_(2)O(g), CO_(2)(g)` and `HCl(g)` are `-25, -57, -94` and `-22` K.cal `mol^(-1)` respectively. The `DeltaH` of the reaction:
`C Cl_(4)(g) +2H_(2)O rarr CO_(2) (g) +4HCl(g)`

A

`-43` K. cal

B

`+72` K.cal

C

`14` K.cal

D

`-125` K.cal

Text Solution

Verified by Experts

The correct Answer is:
A
`DeltaH=H_(P)-H_(R)`
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The standard heats of formation at 298K for C Cl_(4)(g),H_(2)O(g),CO_(2)(g) and HCl(g) are -25.5,-57.8,-94.1 and -22.1 kcal mol^(-1) respectively. Calculate DeltaH_(298)^(@) for the reaction. C Cl_(4)(g)+2H_(2)O(g)toCO_(2)(g)+4HCl(g) .

The standard heat of formation of at 298 K for CCl_(4)(g), H_(2)O(g), CO_(2)(g) and HCI(g) are -25.5, -57.8, -94.1 and -22.1 kcal mol^(-1) respectively. Calculate Delta_(r)H^(Theta) for the reaction r CCl_(4)(g)+2H_(2)O(g) rarr CO_(2)(g)+4HCl(g) Hint : Delta_(r)H^(Theta) = sum Delta_(f)H_("Products")^(Theta)- sum Delta_(f)H_("Reactants")^(Theta)

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