# Answer to Question #89791 in General Chemistry for MOHAMMED

Question #89791

how many Br atoms are in 2.50g of Br

Expert's answer

Bromine exists as a molecule Br_{2}. Calculating first number of molecules Br_{2} 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 Br_{2} molecules:

@$N(Br) = 2N(Br_2) = 2 \cdot 9.406 \times 10^{21} = 1.88 \times 10^{22}@$

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