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From the following data, the heat of for...

From the following data, the heat of formation of `Ca(OH)_(2)(s)` at `18^(@)C` is …. Kcal.
(i) `CaO(s)+H_(2)O(l)=Ca(OH)_(2)(s) , Delta H18^(@)C=-15.26` Kcal…..
(ii) `H_(2)O(l)=H_(2)(g)+1//2O_(2)(g) , Delta H18^(@)C=68.37` Kcal….
(iii) `Ca(s)+1//2O_(2)(g)=CaO(s) , Delta H 18^(@)C=-151.80` Kcal....

A

`-98.69`

B

`-235.43`

C

194.91

D

98.69

Text Solution

Verified by Experts

The correct Answer is:
B
Aim : `Ca+O_2+H_2 rarr Ca(OH)_2,Delta H=? `
`Delta H =Eq^n(i)-Eq(ii) + Eq(iii) `
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From the following data, the heat of formation of Ca(OH)_(2 (g)) at 18^(@) C is ……….. Kcal : CaO_((s)) + H_(2) O _((l)) to Ca(OH)_(2 (s)) , Delta H_(18^(@) C) = -15.26 kcal " " …. (i) H_(2) O_((l)) to H_(2 (g)) + (1)/(2) O_(2 (g)) , DeltaH _(18^(@) C) = 68.37 kcal " " ... (ii) Ca_((s)) + (1)/(2) O_(2(g)) to CaO_((s)), DeltaH_(18^(@) C) = -151.80 kcal " " .... (iii)

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