1.

Calculate DeltaH^(@) for the reaction,Na_(2)O(s)+SO_(3)(g)rarrNa_(2)SO_(4)(g) Given the following : (i) Na(s)+H_(2)O(l)rarrNaOH(s)+(1)/(2)H_(2)(g) DeltaH^(@) =-146 kJ(ii)Na_(2)SO_(4)(s)+H_(2)O(l)rarr2NaOH(s)+SO_(3)(g)DeltaH^(@)=+418 kJ(iii)2Na_(2)O(s)+2H_(2)(g)rarr4Na(s)+2H_(2)O(l) DeltaH^(@)=+259 kJ

Answer»

`+823` kJ
`-581` kJ
`-435` kJ
`+531` kJ

Solution :To obtain required result, Multiply EQ. (i) by 2 & divide eq. (iii) by 2 and add both the eq. then subtract eq. (II) from the sum.


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