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  3. Chemistry
  4. If C(s) +O2(g) -> CO2(g) ; Δ H=r and CO(g) + (1/2) O2 -> CO2(g) : Δ H=s then, the heat of formation of CO is

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Q. If $ \ce{C(s) +O2(g) -> CO2(g)} $ ; $ \Delta H=r $
and $ \ce{CO(g) + \frac{1}{2} O2 -> CO2(g)} $ : $ \Delta H=s $ then, the heat of formation of $ CO $ is

MHT CETMHT CET 2008

Solution:

$C (s)+ O _{2}(g) \rightarrow CO _{2}(g) ; \Delta H=r$...(i)

$CO (g)+\frac{1}{2} O _{2}(g) \rightarrow CO _{2}(g) ; \Delta H=s$...(ii)

$C (s)+\frac{1}{2} O _{2}(g) \longrightarrow CO (g) ; \Delta H=$?

Subtract Eq.(ii) from Eq.(i)

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