Answer:
0.31 g
Explanation:
What is the mass of 2.3 x 1021 atoms of bromine?
1.8 x 1023 g
1.7 x 1043 g
0.31 g
3.4 x 1012
1 mole of Br atoms weigh 80 gm and contain 6.022 X 10^23 atoms
? gm contain 2.3 X 10^21 atoms
set up a ratio
80/(6.022 X 10^23) = ?/ (2.3 X 10^21)
?=80 X (2.3 X 10^21)/(6.O22 X 10^23)
? = 8O X (2.3/6.022) X 1 0^-2
? =0.306 gm
so the answer is
0.31 g
