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M is a metal which forms an oxide, M(2)O...

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 :

A

`+ 180 kJ `

B

`-180 kJ`

C

`-360 kJ`

D

`360 kJ`

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