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Which equation represents the reaction f...

Which equation represents the reaction for the stanard enthalpy of formation ,`DeltaH_(f)^(@),"for"B_(5)H_(9)(g)` at 298 K and 1atm?

A

`5B(S)+9H(g)toB_(5)H_(9)(g)`

B

`2B(S)+3BH_(3)(g)toB_(5)H_(9)(g)`

C

`(5)/(2)B_(2)(g)+(9)/(2)H_(2)(g)toB_(5)H_(9)(g)`

D

`5B(s)+(9)/(2)H_(2)(g)toB_(5)H_(9)(g)`

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The correct Answer is:
d
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