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Find the heat of reaction 2Na(s) +1//2...

Find the heat of reaction
`2Na(s) +1//2O_(2)(g) rarr Na_(2)O(s)`
Given:
`Na_(2)O(s) +H_(2)Orarr 2NaOH, DeltaH =- 56 kcal`
`2Na + 2H_(2)O rarr 2NaOh +H_(2),DeltaH =- 88 kcal`
`H_(2) +1//2O_(2)rarr H_(2)O, DeltaH =- 68 kcal`

Text Solution

Verified by Experts

`2Na +(1)/(2)O_(2)rarr Na_(2)O, DeltaH = ?`
i. `Na_(1)O +H_(2)O rarr 2NaOH, - 56 kcal`
ii. `2Na +2H_(2)O rarr 2NaOH + H_(2), -88 kcal`
iii. `H_(2) +(1)/(2)O_(2) rarr H_(2)O, -68 kcal`
On adding equations (ii) and (iii) and subtracting equation (i), we get the required equation
`DeltaH - (-88-68) - (-56) = - 100 kcal`
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