Question

how many molecules are in 3.68 moles of h₂?
__________ x10²⁴ molecules

Explanation:

Step1: Recall Avogadro's number

1 mole of any substance contains $6.022\times 10^{23}$ molecules.

Step2: Calculate number of molecules

We have 3.68 moles of $H_2$. So the number of molecules $n = 3.68\times6.022\times 10^{23}$.
$n=3.68\times6.022\times 10^{23}=22.161\times10^{23}=2.2161\times 10^{24}$

Answer:

$2.22$ (rounded to two - decimal places)