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Calculate the DeltaH in joules for C("...

Calculate the `DeltaH` in joules for
`C("graphite")toC("diamond")`
from the following data:
`C("graphite")+O_(2)(g)toCO_(2)(g):" "DeltaH^(@)=-393.5kJ`
`C("diamond")+O_(2)(g)toCO_(2)(g)," "DeltaH^(@)=-395.4kJ`

A

1900

B

`-788.9xx10^(3)`

C

`190000`

D

`+788.9xx10^(3)`

Text Solution

Verified by Experts

The correct Answer is:
A
`C("graphite")+O_(2)(g)toCO_(2)(g),DeltaH^(@)=-393.5kJ`
`underline(CO_(2)(g)toC("diamond")+O_(2)(g)," "DeltaH^(@)=+395.4kJ)`
On adding, `underline(C"graphite")toC("diamond"),DeltaH^(@)=+1900J=+1.9kJ)`
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