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8 December, 20:47

A compound that contains both potassium and oxygen formed when potassium metal was burned in oxygen gas. the mass of the compound was 7.11 grams. The mass of the potassium metal was 3.91 grams. What mass of oxygen was involved in this reaction? Justify your answer.

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  1. 8 December, 21:24
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    The mass of oxygen that was involved in the reaction is calculated as below

    mass of the oxygen = mass of the compound - mass of the potassium

    that is 7.11 grams - 3.91 grams = 3.2 grams of oxygen is involved

    This is because the mass of the compound composes the mass of potassium + mass of the oxygen
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