Question

The enthalpies of combustion of carbon and carbon monoxide are `-393.5` and `-283` kJ `mol^(-1)` respectively. The enthaly of formation of carbon monoxide per mole is :
A. `-676.5` KJ
B. `-110.5` KJ
C. 110.5 KJ
D. 676.5 KJ

Answer 1

Correct Answer - B
`C_((s))+(1)/(2)O_(2)rarr CO_((g)) , Delta H_(f) = ?`
`Delta H_(f)=Sigma (Delta H_("Comb."))_(R )-Sigma (Delta H_("Comb."))_(P)=(-393.5)-(-283)`