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Answer:
22.4g
Explanation:
The molar mass of Na
2
SO
4
.10H
2
O is
2(23)+32+4(16)+10(18)=322 g/mol.
1 mole of Na
2
SO
4
.10H
2
O contains 14 moles of O atoms.
1 mole of Na
2
SO
4
.10H
2
O corresponds to 14×16=224 g of O.
Amount of oxygen in 32.2g of Na
2
SO
4
.10H
2
O is 32.2×224322=22.4 g
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