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17 June, 09:06

Baking soda (nahco3) is an active ingredient in some antacids. determine the percent composition of oxygen in baking soda.

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  1. 17 June, 09:15
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    Assuming the question is asking for percent composition by mass,

    The molar mass of sodium bicarbonate is:

    22.990 + 1.008 + 12.011 + 3*15.999 = 84.006 g/mol

    The molar mass of 3 oxygen atoms is:

    3*15.999 = 47.997 g/mol

    The percentage composition by mass is:

    47.997/84.006 * 100% = 57.1% (3 s. f.)
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