1.

In order to decompose 9 g water 142.5 kJ heat is required.Hencethe enthalpy of formation of water is

Answer»

`-142.5 kJ`
`+142.5 kJ`
`-285 kJ`
`+285 kJ`

Solution :For the decomposition of 9gm of water heat required = 142.5 kJ
we KNOW `H_(2)O=2+16=18`
THEREFORE heat required for decomposition of 18gm water `=(18)/(9)xx142.5=285 KJ`


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