1.

Calculate the amount of heat evolved during the complete combustion of `100 ml` of liquid benzene from the following data. (i) `18 g` of graphite on complete combustion evolve `590 KJ` heat (ii) `15889 KJ` heat is required to dissociate all the molecules of `1` litre water into `H_(2)` and `O_(2)` (iii) The heat of formation of liquid benzene is `50 KJ//mol` (iv) Density of `C_(6)H_(6)(l)=0.87 g//ml`

Answer» (i) `C(s)+O_(2)(g)rarrCO_(2)(g), DeltaH_(f)^(@)= -393.33 KJ//mol`
(ii) `H_(2)(g)+(1)/(2)O_(2)(g)rarrH_(2)O(l), Delta H_(f)^(@)= -286 KJ//mol`
(iii) `C_(6)H_(6)(l)+(15)/(2)O_(2)(g)rarr6CO_(2)(g)+3H_(2)O(l)`
`:. DeltaH^(@)=[6(-393.33)+3(-286)]-50=-3268 KJ//"mole"`
`:.` Heat evolved from `87 g` benzene `3645 KJ`


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