Question

Which one of the following contains the same number of atoms as 12 grams of magnesium?

Answer 1

Given ;

W(Mg) = 12 g

We know that ;

M(Mg) = 24 g/mol.

Thus the number of moles : n(Mg) :-

• n = W/M
• n = 12 / 24
• n = 1/2 moles

Thus number of atoms : N = n × NA( Avagadro's number )

• N = 1/2 × 6.022 × 10²³
• N = 3.022 × 10²³

Thus it ompound should have 3.022 × 10²³ atoms

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