1.

Calculate the standard enthalpy change (in kJ "mol"^(-1)) for the reaction H_(2)(g)+O_(2)(g)toH_(2)O_(2)(g), given that bond enthalpy of H-H, O=O,O-H and O-O (in kJ "mol"^(-1)) are respectively 438, 498, 464 and 138.

Answer»

`-334`
`-130`
`+334`
`+130`

ANSWER :B


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