Answer
5.418 x 10²⁴ molecules
Explanation
From Avogadro's constant, 1 mole of any substance contains 6.02 x 10²³ molecules.
This implies;
1 mole H₂S = 6.02 x 10²³ molecules.
∴ 9.00 moles H₂S = x molecules
x molecules x 1 mole H₂S = 9.00 moles H₂S x 6.02 x 10²³ molecules.
[tex]\begin{gathered} x\text{ molecule }=\frac{9.00\text{ moles }H_2S\times6.02\times10^{2}^{3}\text{ }molecules}{1mole\text{ }H_2S} \\ \\ x\text{ molecules }=5.418\times10^{24}\text{ molecules} \end{gathered}[/tex]Hence, he number of molecules in 9.00 moles H₂S = 5.418 x 10²⁴ molecules
