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For the reaction A((g))+B((g)) harr C((g...

For the reaction `A_((g))+B_((g)) harr C_((g))+D_((g))` K is 0.63 at `700^(@)C` and 1.66 at `1000^(@)C`. Then `DeltaH^(@)` is x KCal. What is x?

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The correct Answer is:
8
`log(K_(2))/(K_(1))=(DeltaH^(@))/(2.303R)[(1)/(T_(1))-(1)/(T_(2))]`
`log((1.66)/(0.63))=(DeltaH^(@))/(2.303R)[(1)/(973)-(1)/(1273)]`
`DeltaH^(@)=8000` cal= 8 kcal
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