Question #2e4a2

1 Answer
Henry W.
Oct 23, 2016

#1.81#x#10^24# atoms (3 s.f.)

Explanation:

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#.

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