what is the total number of atoms contained in 80. grams of neon? a) 6.0 x 10^23 b) 1.2 x 10^24c) 2.4 x 10^24 d) 4.8 x 10^24 the answer is c) ,but i have no idea !

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 .

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:

molecular weight of Ne = 20.18 g/mole.

Moles of Ne =

Moles of Ne = 3.96 moles.

1 mole of Ne = atoms.

3.96 moles of Ne = 3.96 atoms

Atoms of Ne = 2.4 .

The total number of atoms in the 80 grams of Neon gas are 2.4 .

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the answer is d. 74.02