Posted by Nathan on Thursday, January 24, 2013 at 11:46pm.
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.
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