1.

The average O-H bond energy in H_(2)O with the help of following data. (1) H_(2)O(l)rarrH_(2)O(g), Delta H= +40.6 kJ mol^(-1) (2) 2H(g)rarrH_(2)(g), DeltaH= -435.kJ mol^(-1) (3) O_(2)(g)rarr2O(g), Delta H= +489.6 kJ mol^(-1) (4) 2H_(2)(g)+O_(2)(g)rarr2H_(2)O(l), Delta H= -571.6 kJ mol^(-1)

Answer»

`584.9 KJ MOL^(-1)`
`279.8 kJ mol^(-1)`
`462.5 kJ mol^(-1)`
`925 kJ mol^(-1)`

Solution :Assuming density of solution is `1g//c c` and specific heat is `4.2 J//gc`
`=msDelta T=100xx4.2xx3`
millimoles of acid neutralized `=5`
`DeltaH= - 100xx4.2xx3xx(1000)/(5)= -2.52xx10^(2)KJ//"mole"`.


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