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15 November, 03:55

Calculate the percent composition by mass of each element in Al (OH) 3. Use at least three significant figures.

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  1. 15 November, 06:44
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    34.59 % Al; 61.54 % O; 3.877 % H

    Explanation:

    % by mass = mass of element/total mass * 100 %

    Let's rewrite the formula of Al (OH) ₃ as AlO₃H₃.

    Set up a table for easy calculation.

    Atom Mass/u Subtotal

    1Al 1 * 26.98 = 26.98 u

    3O 3 * 16.00 = 48.00 u

    3H 3 * 1.008 = 3.024 u

    Total = 78.004 u

    Mass % Al = 26.98/78.004 * 100 % = 34.59 %

    Mass % O = 48.00/78.004 * 100 % = 61.54 %

    Mass % H = 3.024/78.004 * 100 % = 3.877 %
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