Question

At a certain temperature and pressure, 0.20 mol of carbon dioxide has a volume of 3.1 L. A 3.1-L sample of hydrogen at the same temperature and pressure ____.

Answer 1

Answer:
A 3.1 L sample of hydrogen at the same temperature and pressure contains the same number of molecules.

Step-by-step explanation:
As we know ;"1 mole of any gas at STP occupies exactly 22.4 L of volume". Therefore, CO₂ and H₂ gas having same number of moles (0.20 moles) will occupy exactly the same volume.

Now, converting moles into number of molecules,

# of Molecules = Moles × 6.022 × 10²³

Putting value of mole,

# of Molecules = 0.2 mol × 6.022 × 10²³ molecules.mol⁻¹

# of Molecules = 1.20 × 10²³ molecules

Hence, both gases will contain 1.20 × 10²³ molecules.