The amount of bromine molecules in moles is:
"n(Br_2)=\\frac{m(Br_2)}{M(Br_2)}=\\frac{N(Br_2)}{N_A}"
So the number of molecules of bromine can be found:
"N(Br_2)=\\frac{m(Br_2)}{M(Br_2)} \\cdot N_A=\\frac{2.97 \\times 10^5g}{160\\frac{g}{mol}} \\cdot 6.02 \\times 10^{23} mol^{-1}=1.12 \\times10^{27}"
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