Question

How many moles of bromine atoms are in 2.60 × 102 grams of bromine? 1. 0.0152 mol 2. 79.9 mol 3. 10.5 mol 4. 3.25 mol 5. 2.29 mol 6. 0.308 mol 7. 48.6 mol?

Answer 1

There are 3.25 mol of bromine atoms in 2.60 x 102 grams of bromine. I reached this answer by converting grams to moles. To do this, I divided the number of grams that I have of bromine by the weight of bromine. The weight of bromine is 80 grams. So my equation looks like this when it is all set up: 2.6 x 10^2 g/80g. The answer to the equation is 3.25 mol.

Answer 2

moles =mass/ molar mass of the bromine atom
the molar mass of bromine atom is 79.904g/mol
mass=2.60 x10^2
therefore the moles of bromine atom=
2.60 x10^2g/ 79.904g/mol =3.25gmoles(answer 4)