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Calculate the enthalpy change for the tr...

Calculate the enthalpy change for the transition, graphite `iff` diamond from the `Delta H _("comb") ^(@)` values of `-393.5kJ mol^(-1) and -395.4 kJ mol^(-1)` for graphite and diamond, respectively.

Text Solution

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C(s,graphite) `+ O _(2) (g) to CO _(2) (g), =- 393. kj mol ^(-1) ..(i)`
C, (s,diamond) `+ O _(2) (g) to CO _(2) (g) , Delta H _("comb") ^(@) =- 395.4 kJ mol ^(-1) ...(ii)`
Subtracting equation (ii) from equation (i)
C (s,graphite) `to C` (s, diamond), `Delta H _(u) ^(@) =+ 1. 9 kJ mol ^(-1)`
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