Magnesium + Oxygen $⟶$ Magnesium Oxide + Oxygen
48.6 g + 50.0 g $⟶$ 80.6 g + ?
Predict the mass of oxygen that will be left over after the reaction of 48.6 grams of magnesium with 50.0 grams of oxygen.

20.6

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19.6

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17.6

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Solution

The correct option is B 18
According to law of conservation of mass, the total mass of reactants must equal the total mass of products
If we assume the mass of oxygen as $X$ g then,

Total mass of reactants = Total mass of products
$48.6 + 50 = 80.6 + X$

$X = 18 g$

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