Question

1. convert 8.00 × 10²⁰ molecules of h₂ to moles.

Explanation:

Step1: Recall Avogadro's number

Avogadro's number is $6.022 \times 10^{23}$ molecules/mol, which relates molecules to moles.

Step2: Set up conversion formula

Divide the number of molecules by Avogadro's number to get moles:
$\text{Moles of } H_2 = \frac{\text{Number of molecules}}{\text{Avogadro's number}}$

Step3: Substitute values and calculate

$\text{Moles of } H_2 = \frac{8.00 \times 10^{20}}{6.022 \times 10^{23}}$
$\text{Moles of } H_2 \approx 1.33 \times 10^{-3}$

Answer:

$1.33 \times 10^{-3}$ moles of $H_2$