Question

1. calculate the number of moles of molecules in $1.20 \times 10^{24}$ molecules of carbon monoxide (co).

Explanation:

Step1: Recall Avogadro's constant

Avogadro's number $N_A = 6.02 \times 10^{23}$ molecules/mol.

Step2: Use mole-molecule conversion formula

Moles $n = \frac{\text{Number of molecules}}{N_A}$
$$n = \frac{1.20 \times 10^{24}}{6.02 \times 10^{23}}$$

Step3: Calculate the result

$$n \approx 1.99 \approx 2.00$$

Answer:

The number of moles is approximately $\boldsymbol{2.00}$ mol (or $\boldsymbol{1.99}$ mol for more precision).