Question

Question #2e4a2

Answer 1

`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`.