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Calculate the heat of transition for car...

Calculate the heat of transition for carbon from the following:
`C_("Diamond") +O_(2) rarr CO_(2)(g),DeltaH =- 94.3 kcal`
`C_("Amorphous") +O_(2) rarr CO_(2)(g),DeltaH =- 97.6 kcal`
Also calculate the heat required to change `1g` of `C_("Diamond")` to `C_("Amorphous")`.

Text Solution

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The correct Answer is:
3
`C_(D)+O_(2(g))rarr CO_(2(g)), DeltaH=-94.3kcal ...(1)`
`C_(A)=O_(2(g))rarr CO_(2(g)),DeltaH=-97.3kcal ...(2)`
Subtracting `eq.(2)` from `eq.(1)`,
`C_(D) rarr C_(A), DeltaH=+3.0kcal`
or heat of transition of `C_(DrarrA)=+3.0kcal`
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