The number of moles of liquid bromine ([tex]Br_{2}[/tex]) present in the flask = 0.230 mol bromine.
1 mole of any substance has Avogadro number of formula units (atoms, molecules, or ions)
Avogadro's number is [tex]6.022*10^{23}[/tex]
The conversion factor between moles and number of formula units say molecules: [tex]1 mole=6.022*10^{23}molecules[/tex]
Converting the given moles of liquid bromine to molecules:
[tex]0.230molBr_{2}*\frac{6.022*10^{23} molecules }{1 mol}=1.39*10^{23}molecules[/tex]
Therefore, 0.230 moles of liquid bromine contain [tex]1.39*10^{23}molecules[/tex].
