Question

Find the number of moles of $N{a}_{2}C{O}_3$ which contain 4.5 moles of oxygen atoms.

• A. 1.0 mol
• B. 1.5 mol
• C. 4.5 mol
• D. None of these

Answer 1

The correct option is B 1.5 mol

From the molecular formula of $N{a}_{2}C{O}_3$,
one mole of sodium carbonate contains 3 moles of O atom.

The number of moles of sodium carbonate that contain 4.5 moles of O atoms = $\frac{1\times 4.5}{3}=1.5mol$