Answer
There are $7.71 \times 10^{23} molecules$ of $SO_2$ in 1.28 moles of that.
Work Step by Step
1. State the data and objective:
$1.28$ moles of $SO_2$
Objective: Number of $SO_2$ molecules.
2. Identify the conversion factor.
Using Avogadro's number:
1 mole $SO_2$ $= 6.02 \times 10^{23}$ $SO_2$ $molecules$
$\frac{1 mole (SO_2)}{6.02 \times 10^{23} molecules (SO_2)}$ and $\frac{6.02 \times 10^{23} molecules (SO_2)}{1 mole (SO_2)}$
3. Use the conversion factor and the data to calculate the number of $SO_2$ molecules:
$1.28 mole (SO_2) \times \frac{6.02 \times 10^{23} molecules (SO_2)}{1 mole(SO_2)} = 7.71 \times 10^{23} molecules (SO_2)$
