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For the reaction H2+I2 hArr 2HI, DeltaH=...

For the reaction `H_2+I_2 hArr 2HI, DeltaH`=12.40 Kcal the heat of formation of HI is _____

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`H_2+ I_2 to 2HI " " DeltaH`=12.40 K.cal
`1//2 H_2 +1//2 I_2 to HI =DeltaH//2`
`therefore 12.40/2=6.20 "K.cal mol"^(-1)`
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