1. You have a stock solution of 14.2 M NH3. How many milliliters of this solution should you dilute to make 1000 mL of 0.210 M NH3?         Express your answer using three significant figures.   2. If you take a 15.0-mL portion of the stock solution and dilute it to a total volume of 0.700 L, what will be the concentration of the final solution?        Express your answer using three significant figures.

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