Mole qn...?

A Put two drops of hydroxylamine solution in a .5 ml well. Then add eight drops of 5 mg L^-1 iron. How many moles of ipyridine and how many moles of iron are in the well? There are about 20 drops to 1 ml.

B. If you want to repeat the mixuture from part A on a larger scale, descrie how many milliliters of hydroxylamine solution, how many milliliters of bipyridine solution, and how many milliliters of iron solution you need to make 2.50 ml of total solution volume.

Footnote: List the relationship between volume and mole also, 22.4 l=1 mol?

Answer:
what is the system you're working with? When does Bipyridine ever come into play? I don't see it being added.

The relationship between volume and moles of 22.4L=1mol works only for gases at STP (0 C, 1 atm). For liquids and solids you have to know mass and molecular weight.

8 drops of 5 mg/L iron is (based on 20 drops =1 mL):
8 dr*1mL/20dr * 5mg/L * 1L/1000mL * 1g/1000mg * 1 mol iron/ 55.85 g = 3.581e-8 moles iron.

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