Given that: i. `C("graphite") +O_(2)(g) rarr CO_(2)(g), DeltaH =- 393.7 kJ` ii. `C("diamond") rarr C("graphite"), DeltaH =- 2.1 kJ` a. Calculate `DeltaH` for buring of diamond of `CO_(2)`. b. Calculate the quantity of graphite that must be burnt to evolve `5000 kJ` of heta.

Given that: i. `C("graphite") +O_(2)(g) rarr CO_(2)(g), DeltaH =- 393.

1.	Given that: i. `C("graphite") +O_(2)(g) rarr CO_(2)(g), DeltaH =- 393.7 kJ` ii. `C("diamond") rarr C("graphite"), DeltaH =- 2.1 kJ` a. Calculate `DeltaH` for buring of diamond of `CO_(2)`. b. Calculate the quantity of graphite that must be burnt to evolve `5000 kJ` of heta.
Answer» a. To calculate `DeltaH` of the reaction `C("diamond") +O_(2)(g) rarr CO_(2)(g), DeltaH = ?` `DeltaH = DeltaH_(1) +DeltaH_(2)` `=- 393.7 - 2.1 =- 395.8 kJ` b. `1`mole of `C`(graphite) i.e. `12 g` on buring evolves heat `= 393.7 kJ` `393.7 kJ` of heat obtained from `- 12 gC` `:. 5000 kJ` of heta is evolved from `= (12 xx 5000)/(393.7)` `= 152.4 g` of graphite

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Given that: i. `C("graphite") +O_(2)(g) rarr CO_(2)(g), DeltaH =- 393.7 kJ` ii. `C("diamond") rarr C("graphite"), DeltaH =- 2.1 kJ` a. Calculate `DeltaH` for buring of diamond of `CO_(2)`. b. Calculate the quantity of graphite that must be burnt to evolve `5000 kJ` of heta.

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