Answer:
1 g of He contains greater number of atoms.
Proof:
Number of Atoms in 1 g of He:
Step 1: Calculate Moles of 1 g He as,
Moles = Mass ÷ M.Mass
Moles = 1 g ÷ 4 g.mol⁻¹
Moles = 0.25 mol
Step 2: Calculate Number of Atoms of He as,
# of Atoms = Moles × 6.022 × 10²³
Putting value of moles,
# of Atoms = 0.25 × 6.022 × 10²³
# of Atoms = 1.50 × 10²³ Atoms of He
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Number of Atoms in 1 g of Ne:
Step 1: Calculate Moles of 1 g He as,
Moles = Mass ÷ M.Mass
Moles = 1 g ÷ 20.18 g.mol⁻¹
Moles = 0.0495 mol
Step 2: Calculate Number of Atoms of Ne as,
# of Atoms = Moles × 6.022 × 10²³
Putting value of moles,
# of Atoms = 0.0495 × 6.022 × 10²³
# of Atoms = 2.98 × 10²² Atoms of Ne
