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15 April, 13:27

If 3.5 g of element X reacts with 10.5 g of element Y to form the compound XY.

what is the percent by mass of element X in the compound? The percent by mass

of element Y?

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Answers (1)
  1. 15 April, 13:35
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    The percentage by mass of element X is 25 %.

    The percentage by mass of element Y is 75 %

    Explanation:

    X + Y ⇒ XY

    3.5 g of element X + 10.5 g of element Y = 14g in total

    ⇒Element X : 3.5g / 14g = 0.25 ⇒ x 100 % = 25 %

    ⇒Element Y : 10.5 / 14 = 0.75 ⇒ x 100 % = 75 %

    The percentage by mass of element X is 25 %.

    The percentage by mass of element Y is 75 %
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