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13 December, 17:55

A binary compound created by reaction of bismuth and an unknown element E contains 52.07% Bi and 47.93% E by mass. If the formula of the compound is Bi2E3, calculate the atomic mass of E.

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  1. 13 December, 19:39
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    Atomic mass of E is 128.24

    Explanation:

    The percentage composition by mass of an element in a compound is given by dividing the mass of the element by the total mass of the compound and expressing it as a percentage. In this case; the compound Bi₂E₃

    Percentage composition of bismuth = 52.07%

    Percentage composition of E = 47.93%

    Mass Bismuth in the compound is (2*208.9804) = 417.96 g

    Therefore,

    To calculate the atomic mass of E

    52.07% = 417.96 g

    47.93% = ?

    = (47.93 * 417.96) : 52.07 %

    = 384.729

    E₃ = 384.729

    Therefore; E = 384.729 : 3

    = 128.24

    The atomic mass of E is 128.24
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