# Chemistry

If a procedure calls for 2mL of a concentrated nitric acid, what are the mass and moles of the HNO3 actually used in the reaction?

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1. How concentrated is the "concentrated" HNO3?
If you are talking about commercial grade conc HNO3, it has a density of about 1.4 g/mL and it is about 68% by weight HNO3. You need to confirm these values from your text or notes and use those numbers instead of these estimates.

mass soln = 1.40g/mL x 2 mL = ?
mass HNO3 = ?g mass soln x 0.68 = ? g HNO3
mols HNO3 = grams HNO3/molar mass HNO3.

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