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If, H(2)(g)+Cl(2)(g)rarr 2HCl(g) , Delta...

If, `H_(2)(g)+Cl_(2)(g)rarr 2HCl(g) , Delta H^(@)=-44` Kcal
`2Na(s)+2HCl(g)rarr 2NaCl(s)+H_(2)(g), Delta H=-152` Kcal Then, `Na(s)+0.5Cl_(2)(g)rarr NaCl(s) , Delta H^(@) = ?`

A

`-108 kcal`

B

`-196kcal`

C

`-98 kcal`

D

`-54 kcal`.

Text Solution

Verified by Experts

The correct Answer is:
C
Multiply eq. (i) by `1//2` and also `(ii)` by `1//2` and add the two reactions.
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H_(2)(g) + Cl_(2) rarr 2HCl (g), Delta H = -44K.cals 2 Na(s)+2HCl (g)rarr 2NaCl(s)+H_(2)(g), Delta H = -152K.cal Na(s)+(1)/(2)Cl_(2)(g) rarr NaCl(s), Delta H = ?

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