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

Question

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 (A)  r+s  (B)  r-s  (C)  s-r  (D)  rs

Tardigrade Admin · Accepted Answer

C (s)+ O 2(g) arrow CO 2(g) ; Δ H=r...(i) CO (g)+(1/2) O 2(g) arrow CO 2(g) ; Δ H=s...(ii) C (s)+(1/2) O 2(g) longrightarrow CO (g) ; Δ H=? Subtract Eq.(ii) from Eq.(i) <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/chemistry/55a7adf20c0db847ad9a366a34d9ea88-.png" />

Q. If $C (s) + O X_{2} (g) CO X_{2} (g)$ ; $Δ H = r$
and $CO (g) + \frac{1}{2} O X_{2} CO X_{2} (g)$ : $Δ H = s$ then, the heat of formation of $CO$ is

$r + s$

$r - s$

$s - r$

$rs$

$C (s) + O_{2} (g) \to C O_{2} (g); Δ H = r$ ...(i)

$CO (g) + \frac{1}{2} O_{2} (g) \to C O_{2} (g); Δ H = s$ ...(ii)

$C (s) + \frac{1}{2} O_{2} (g) ⟶ CO (g); Δ H =$ ?

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

Q. If C(s)+OX2​(g)​COX2​(g) ; ΔH=r and CO(g)+21​ OX2​​COX2​(g) : ΔH=s then, the heat of formation of CO is

r+s

r−s

s−r

rs