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If enthalpy of combustion of carbon to C...

If enthalpy of combustion of carbon to `CO_(2)`(g) is -394.0kJ`mol^(-1)`, the enthalpy change for the formation of 17.6 g of `CO_(2)` from carbon and dioxygen at the same temperature in kJ is

A

-157.6

B

315.2

C

157.6

D

-315.2

Text Solution

Verified by Experts

The correct Answer is:
A
Reaction for combusion is
`C+O_(2)toCO_(2),DeltaH=-394KJmol^(-1)`
`because` Molar mass of `CO_(2)=12+(2xx10)`
and `" "=44g`
`because` 44g of formation of `CO_(2)` gives heat = - 394.0 kJ
`therefore` 17.6 g of formation of
`CO_(2)`, gives heat = `(-394xx17.6)/44=-157.6kJ`.
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