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Given that: i. C("graphite") +O(2)(g) ...

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 burning of diamond of `CO_(2)`.
b. Calculate the quantity of graphite that must be burnt to evolve `5000 kJ` of heat.

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Verified by Experts

The correct Answer is:
`(a) -395.8 kj (b) 152.4 g `
(a) Eqn.(ii)-Eqn. (i) gives the required result.
(b) 393.7 kJ of heatis producedfrom graphite `= 12g`
`:.` 5000kJ of heat will be produced from graphite `=(12)/( 393.7) xx5000g = 152.4g`
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