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QUESTION

# How many atoms are in 1.50 moles of fluorine gas?

1.81x10^24 atoms (3 s.f.)

Recall that moles can be converted to particles using Avogadro's constant (6.022*10^23) which is the number of molecules per mole of a substance.

In 1.5 moles of fluorine gas, there are 1.5*6.022*10^23 molecules of gas. However, since fluorine is diatomic (F_2), each molecule contains two atoms of fluorine. Thus, the number of atoms in 1.5 mol of F_2 is twice the number of molecules.

:. No. of atoms =2(1.5*6.022*10^23)=1.8066*10^24

=1.81*10^24 (3 s.f.), since there are 3 s.f. in 1.50.