1.

In order to decompose 9 grams of water 142.5 KJ heat is required. Hence the enthalpy of formation of water isA. `+142.5 KJ`B. `-142.5 KJ`C. `+285 KJ`D. `-285 KJ`

Answer» Correct Answer - D
`9 gm rarr 142.5 KJ`
`18 gm rarr` ?


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