Neon has a molar mass of 20.18 g/mol so the number of moles is:
moles Ne = 80 / 20.18
moles Ne = 3.96 mol
We know that the Avogadros number is 6.022 x 10^23 atoms / mol so:
atoms Ne = 3.96 mol * 6.022 x 10^23 atoms / mol
atoms Ne = 2.4 x 10^24
So the answer is C
The total number of atoms in the 80 grams of Neon gas are 2.4 [tex]\rm \times\;10^2^4[/tex] .
The number of atoms present in 1 mole of an element is given by the Avogadro number.
Since the weight of Neon gas is 80 grams. The moles of Ne gas are:
[tex]\rm Moles\;=\;\dfrac{weight}{molecular\;weight}[/tex]
molecular weight of Ne = 20.18 g/mole.
Moles of Ne = [tex]\rm \dfrac{80\;g}{20.18\;g/mole}[/tex]
Moles of Ne = 3.96 moles.
1 mole of Ne = [tex]\rm 6.023\;\times\;10^2^3[/tex] atoms.
3.96 moles of Ne = 3.96 [tex]\rm \times\;6.023\;\times\;10^2^3[/tex] atoms
Atoms of Ne = 2.4 [tex]\rm \times\;10^2^4[/tex].
The total number of atoms in the 80 grams of Neon gas are 2.4 [tex]\rm \times\;10^2^4[/tex] .
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