How many argon (ar) atoms are there in 1.5 * 102 g of argon?

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Chemistry

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1 September, 19:14

How many argon (ar) atoms are there in 1.5 * 102 g of argon?

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Draven Hopkins · Answer 1

Answer is: there is 2,25·10²⁴ argon atoms.

m (Ar) = 1,5·10² g = 150 g.

n (Ar) = m (Ar) : M (Ar).

n (Ar) = 150 g : 40 g/mol.

n (Ar) = 3,75 mol.

N (Ar) = n (Ar) · Na.

N (Ar) = 3,75 mol · 6·10²³ 1/mol.

N (Ar) = 2,25·10²⁴.

n - amount of substance.

Na - Avogadro number.

M - molar mass of atom.

m - mass of atom.