Answer:
1.37 × 10²³ atoms CO₂
Explanation:
Step 1: Define
Avagadro's Number: 6.02 × 10²³ atoms, molecules, formula units
Molar Mass C - 12.01 g/mol
Molar Mass O - 16.00 g/mol
Molar Mass CO₂ - 44.01 g/mol
Step 2: Use Dimensional Analysis
[tex]10.0 \hspace{3} g \hspace{3} CO_2(\frac{1 \hspace{3} mol \hspace{3} CO_2}{44.01 \hspace{3} g \hspace{3} CO_2} )(\frac{6.02(10)^{23} \hspace{3} atoms \hspace{3} CO_2}{1 \hspace{3} mol \hspace{3} CO_2} )[/tex] = 1.36787 × 10²³ atoms CO₂
Step 3: Simplify
We have 3 sig figs.
1.36787 × 10²³ atoms CO₂ ≈ 1.37 × 10²³ atoms CO₂
