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Calcutate DeltaH in kJ for the following...

Calcutate `Delta`H in kJ for the following reaction
` C(g)+O_(2)(g)`
Given that ,
`H_(2)O(g)+C_(g)toCO(g)+H_(2)(g),""""" DeltaH=+131kJ`
`CO(g)+(1)/(2)O_(2)(g)toCO_(2)(g) """"'DeltaH=-282kJ`
`H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(g) """""DeltaH=-242kJ`

A

`-393`

B

`+393`

C

`+655`

D

`-655`

Text Solution

Verified by Experts

The correct Answer is:
A
Add the given equations and their `DeltaH`values.
Equation I: `H_(2)O(g)+C(g)toCO(g)+H_(2)(g),H_(2)(g),DeltaH=+131kJ`
Equation II: `CO_(g)+(1)/(2)O_(2)(g)toCO_(2)(g),""""DeltaH=-282kJ`
underline(EquationIII: `H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(g),""""DeltaH-242kJ`)
Final Reaction :`C(g)+O_(2)(g)toCO_(2)g," "DeltaH=-393kJ`
`therefore` For the reaction `C(g)+O_(2)(g)toCO_(2)(g)`
`DeltaH=-393kJ`
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