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Given these reactions : Ato2B DeltaH=4...

Given these reactions :
`Ato2B DeltaH=40KJ`
` BtoCDeltaH=-50KJ`
` 2CtoD DeltaH=-20KJ`
Calculate `DeltaH` for the reaction : `D+Ato4C`

A

`-100KJ`

B

`-60KJ`

C

`-40KJ`

D

`100Kj`

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The correct Answer is:
c
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