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Calculate the number of grams of oxygen ...

Calculate the number of grams of oxygen in 0.10 mol of `Na_(2)CO_(3).10H_(2)O`.

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1 mole of `Na_(2)CO_(3).10H_(2)O` contain 13 moles of oxygen atoms.
0.1 mole `Na_(2)CO_(3).10H_(2)O` contains `13 xx 0.1 = 1.3` moles of oxygen atoms.
Mass of oxygen atoms `=1.3 xx 16 = 20.8`g.
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