Answer:
1.27 × 10²³ molecules SO₂
Explanation:
Step 1: Define
Avagadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.
Molar Mass of S - 32.07 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of SO₂ = Molar Mass of S + 2 Molar Mass of O
Molar Mass of SO₂ - 64.07 g/mol
Step 2: Use Dimensional Analysis
[tex]13.5 \hspace{3} g \hspace{3} SO_2(\frac{1 \hspace{3} mol \hspace{3} SO_2}{64.07 \hspace{3} g \hspace{3} SO_2} )(\frac{6.02(10)^{23} \hspace{3} molecules \hspace{3} SO_2}{1 \hspace{3} mol \hspace{3} SO_2} )[/tex]
1.26846 × 10²³ molecules SO₂
Step 3: Simplify
We are given 3 sig figs.
1.26846 × 10²³ molecules SO₂ ≈ 1.27 × 10²³ molecules SO₂
