Answer to Question #89791 in General Chemistry for MOHAMMED

Question #89791
how many Br atoms are in 2.50g of Br
1
Expert's answer
2019-05-16T06:24:56-0400

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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