How many grams of concentrated nitric acid should be used to prepare 250 mL of 2.0 M HNO3?31.5 g54.0 38.5 g90.0 g
Question
How many grams of concentrated nitric acid should be used to prepare 250 mL of 2.0 M HNO3?
- 31.5 g
- 54.0 g
- 38.5 g
- 90.0 g
Solution
To solve this problem, we need to use the formula for molarity which is M = moles/Liter.
Step 1: Convert the volume from mL to L. 250 mL = 0.25 L
Step 2: Calculate the number of moles needed. Moles = Molarity x Volume = 2.0 M x 0.25 L = 0.5 moles
Step 3: Calculate the mass of HNO3 needed. The molar mass of HNO3 is approximately 63 g/mole. Mass = Moles x Molar mass = 0.5 moles x 63 g/mole = 31.5 g
So, 31.5 g of concentrated nitric acid should be used to prepare 250 mL of 2.0 M HNO3.
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