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10 February, 05:15

A 2.5 mg sample of magnesium powder is ignited with 2 mg oxygen in a sealed container. All of the magnesium is consumed and 4.15 mg of white solid magnesium oxide is formed.

Find the mass of the unreacted oxygen

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  1. 10 February, 05:28
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    Total mass of the reactant = 2+2.5 = 4.5 mg

    Total mass of product = 4.15 mg

    therefore, mass of unreacted oxygen = 4.50-4.15 = 0.35 g
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