Question

Combustion equation of Carbon and carbon monoxide are
C + O2 =CO2 ∆H = -394 KJ/KG.MOLE
CO+ 1/2O2=CO2 ∆H=-284.5 KJ/KG.MOLE
Heat of formation of Co is..........

Answer 1

c + o2 = co2 - 394 ..............1
now
co + 1\2 o2 = co2 -284.5.............2
or
co2 = co + 1/2 o2 284.5................3

1 + 3 we get
c + 1/2 o2 = co
$284.8 - 394 = 109.2$