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The entropies of H(2) (g) and H (g) are ...

The entropies of `H_(2)` (g) and H (g) are 130.6 and 114.6 J `mol^(-1)K^(-1)` respectively at 298 K. Using the data given below calculate the bond energy of `H_(2)` (in kJ/mol) :
`H_(2)(g)rarr2H(g),DeltaG^(@)=406.6kJ`

A

377.2

B

436

C

425.5

D

430.5

Text Solution

Verified by Experts

The correct Answer is:
B
`DeltaG=DeltaH-TDeltaS`
`406.6 xx1000=DeltaH-298(2xx114.6 -130.6)`
`DeltaH=406.6 xx1000+298(98.6)`
`DeltaH=436 " kJ mol"^(-1)`
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