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The number of grams of oxygen in 0.10 mo...

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

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The correct Answer is:
B
`Na_(2)CO_(3).10H_(2)O`=1 mole
1 mole of `Na_(2)CO_(3) .10H_(2)O` contains 13 oxygen atoms.
Mass of 13 oxygen atoms = `13 xx 16 = 208`
1 mole of `Na_(2)CO_(3) .10H_(2)O` contains 208 g of oxygen.
`:.` 0.10 mole of `Na_(2)CO_(3).10H_(2)O` contains `208/1xx0.1=20.8g`
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