Determine the mass of oxygen in a 5.8 g sample of sodium bicarbonate (nahco3).

Answer is: the mass of oxygen is 3.31 grams.

m(NaHCO₃) = 5.8; mass of sodium bicarbonate.

n(NaHCO₃) = m(NaHCO₃) ÷ M(NaHCO₃).

n(NaHCO₃) = 5.8 g ÷ 84 g/mol.

n(NaHCO₃) = 0.07 mol; amount of sodium bicarbonate.

In one molecule of sodium bicarbonate there are three oxygen atoms:

n(NaHCO₃) : n(O) = 1 : 3.

n(O) = 3 · 0.07 mol.

n(O) = 0.21 mol.

m(O) = 0.21 mol · 16 g/mol.

m(O) = 3.31 g.

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