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Calorific Value and Efficiency of a Fuel

Which one of ...

Question

Which one of the following chemical equations represent combustion reactions?

A: $C + O_{2} \to C O_{2}$
B: $C + \frac{1}{2} O_{2} \to C O$
C: $C O + \frac{1}{2} O_{2} \to C O_{2}$

A,B

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B,C

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A,C

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Solution

The correct option is C A,C
In combustion reaction $C O_{2}, H_{2} O$ and $S O_{2}$ should be formed. In option B, CO is formed so not a combustion reaction.

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Similar questions

From the thermo chemical reactions,

$C_{(g r a p h i t e)} + \frac{1}{2} O_{2} \to C O; Δ H = - 110.5 K J$

$C O + \frac{1}{2} O_{2} \to C O_{2}; Δ H = - 283.2 K J .$

$Δ H$ for the reaction, $C_{(g r a p h i t e)} + O_{2} \to C O_{2}$ is:

From the thermochemical reactions,

C + 1/2O₂ → CO; ∆H = -110.5 kJ

CO + 1/2O₂→ CO₂; ∆H = -283.2 kJ

The heat of reaction C + O₂ → CO₂ is:

C + O_{2} \to C O_{2}

C + \frac{1}{2} O_{2} \to C O

C O + \frac{1}{2} O_{2} \to C O_{2}

k J / m o l

C

+ \frac{1}{2} O_{2} \to C O; Δ H = - 110.5

C O + \frac{1}{2} O_{2} \to C O_{2}; Δ H = - 283.2

C (graphite) + O_{2} \to C O_{2}

C + O_{2} \to C O_{2}; Δ H = - 94 K c a l;

C O + \frac{1}{2} O_{2} \to C O_{2}; Δ H = - 67.7 K c a l

C O

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