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16 September, 23:32

When a 14.2-g sample of mercury (II) oxide is decomposed into its elements by heating, 13.2 g Hg is obtained. What is the percent composition of the compound?

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  1. 16 September, 23:44
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    Mercury (ii) oxide is made up of mercury and oxygen. The total mass of mercury (ii) oxide is 14.2 g, after decomposition 13.2 g of mercury were formed, therefore the mass of oxygen 1 g (14.2 g - 13.2 g).

    Percentage of oxygen = (1/14.2) * 100 = 7.04%

    Percentage of mercury = (13.2/14.2) * 100 = 92.96%

    Therefore, percentage composition of the compound, oxygen is 7.04% and mercury is 92.96%.
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