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If I have a stock solution that has a Cm of 0.0080g/mL, how can I calculate to prepare 50mL dilutions of the stock to 80,

If I have a stock solution that has a Cm of 0.0080g/mL, how can I calculate to prepare 50mL dilutions of the stock to 80, 60, and 40% of its original concentration?

Thanks!

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