We have the right to calculate the percent compositon of any type of of the facets in a compound by including the atomic masses of each facet and divide that mass by the total compiound mass to acquire a percent. In this instance. the 3 oxygen atoms account for 48 amu of the full 84 amu. That renders it 57.1% of the total.

15 grams*(0.5714) = 8.57 grams of O is 8.57 grams of oxygen atoms in 15 grams of NaHCO3.

Bob

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