If 10 gms of $M g$ react with 20 gms of $O_{2}$ , then how many grams of $M g O$ is formed?

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Solution

The correct option is C
30

According to the law of conservation of mass, mass is neither created nor destroyed ". So 10 gms of $M g$ react with 20 gms of $O_{2}$ to give 30 gms of $M g O$ .

Since the total mass of reactants is 30, the total mass of product also will be 30.

$M g + O_{2} \to M g O$ .

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