There are 5.5 × 10^22 atoms of oxygen in 2.0-g sample of washing soda.
The formula of washing soda is Na2CO3.10H2O
The molar mass of the compound is;
[2(23) + 12 + 3(16) + 10(2(1) +16)]
= 286 g/mol
Number of moles = 2.0-g/286 g/mol = 0.00699 moles
If 1 mole of washing soda contains 13 atoms of oxygen
0.00699 moles of washing soda contains 0.00699 moles × 13 = 0.0908 NA atoms
Where NA = Avogadro's number
Hence,
Number of oxygen atoms= 0.0908 × 6.02 × 10^23 = 5.5 × 10^22 atoms of oxygen
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