1.

The molar entropies of HI(g), H(g) and I(g) at 298 K are 206.5, 114.6, and 180.7 J mol^(-1)K^(-1)respectively. Using the DeltaG^(@) given below, calculate the bond energy of HI.HI(g)rarrH(g)+I(g)," "DeltaG^(@)=271.8 kJ

Answer»

`282.4 kJ "mol"^(-1)`
`298.3 kJ "mol"^(-1)`
`290.1 kJ "mol"^(-1)`
`315.4 kJ "mol"^(-1)`

Solution :`DeltaS^(@) =-206.5+114.6 +180.7 =88.8`
`DeltaG^(@)=DELTAH^(@)-TDeltaS^(@)`
`DeltaH^(@)=271.8 + 298 xx88.8 XX 10^(-3)`
`DeltaH^(@)=298.3`


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