Determine the volume of Fe(NO3)3 stock solution needed to prepare a dilute solution (left side), then decide what volume of dilute solution should be prepared (right side)

Here's what I get  

Explanation:

Assume you want to use 0.5 mL of a stock solution with a concentration of 0.2 mol·L⁻¹.  

You want to prepare a 0.002 mol·L⁻¹ solution.

1. Moles of Fe(NO₃)₃

2. Volume of dilute solution

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