Question

Please help I am kinda confused

Answer 1

1.27 × 10²³ molecules SO₂

Step-by-step 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

`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} )`

1.26846 × 10²³ molecules SO₂

Step 3: Simplify

We are given 3 sig figs.

1.26846 × 10²³ molecules SO₂ ≈ 1.27 × 10²³ molecules SO₂