How many moles of bromine are there in a 0.35 mL dichloromethane solution of 10% bromine?

Question

Density of Bromine = 3.10g/mL
Density of dichloromethane = 1.33g/mL

Answer 1

I assume this is percent w/v.
10% bromine means 10g Br2 in 100 mL soln.
How much is in 0.35 mL soln =
10 g x (0.35/100) = 0.035 g Br2.
Then mols = grams/molar mass.