Two bottles, I and II, have the same volume and are at the same temperature - VCE - SSCE Chemistry - Question 17 - 2007 - Paper 1

To determine the number of atoms, we first need to calculate the number of moles for each gas using the molar mass.

• The molar mass of argon (Ar) is approximately 40 g/mol. Thus, for bottle I:

  $ext{Moles of Ar} = \frac{10 \text{ g}}{40 \text{ g/mol}} = 0.25 \text{ moles}$

• The molar mass of neon (Ne) is approximately 20 g/mol. Thus, for bottle II:

  $\text{Moles of Ne} = \frac{10 \text{ g}}{20 \text{ g/mol}} = 0.5 \text{ moles}$

Since both bottles have the same volume and each mole of gas contains the same number of atoms according to Avogadro's principle, bottle II has approximately double the number of atoms compared to bottle I.