Which of the following chemical equation satisfies the law of conservation of mass?

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

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

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$4 C + O_{2} \to C O_{2}$

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

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Solution

The correct option is A
$C + O_{2} \to C O_{2}$

Law of conservation of mass states that mass cannot be created or destroyed. It can change forms but is conserved.
Hence, in a chemical reaction, mass of the products equals to the mass of the reactants. This is only possible if the chemical equation is correctly balanced.
The only reaction which is balanced is:
$C + O_{2} \to C O_{2}$
So, Option A follows law of conservation of mass.

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Which one of the following chemical equations represent combustion reactions?

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

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If H₂+ O₂= H₂O . So, while proving law of conservation of mass Why we take O₂as 1/2 O₂?

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C O, O_{2}, N_{2} a n d C O_{2}

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