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What is the standed enthalpy of formatio...

What is the standed enthalpy of formation of MgO(s) is 300.9 Kj is evoled when 20.15 g of MgO(s) is formaed by the combustion when magnesium under standerd conditions?

A

`-597.3KJ mol^(-1)`

B

`-300.9KJ mol^(-1)`

C

`+300.9KJ mol^(-1)`

D

`+597.3KJ mol^(-1)`

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