1.

M is a metal which forms an oxide, M_(2)O and (1)/(2) M_(2)O(s) rarr M(s) + (1)/(4) O_(2)(g), Delta H = 90 kJ mol^(-1) When a sample of the metal M reacts with 1 mole of O_(2)(g) to form M_(2)O, DeltaH for the reaction is :

Answer»

`+ 180 KJ `
`-180 kJ`
`-360 kJ`
`360 kJ`


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