Bromine exists as a molecule Br2. Calculating first number of molecules Br2 in 2.50g of bromine:
"N(Br_2) = \\frac{m(Br_2)}{M(Br_2)}\\cdot N_A = \\frac{2.50g}{160\\frac{g}{mol}}\\cdot 6.02\\times 10^{23}mol^{-1} = 9.406\\times 10^{21}"
Number of Br atoms is two times more than number of Br2 molecules:
"N(Br) = 2N(Br_2) = 2 \\cdot 9.406 \\times 10^{21} = 1.88 \\times 10^{22}"
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