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March 30, 2015

Homework Help: chemistry

Posted by Sarah on Wednesday, January 21, 2009 at 7:54pm.

A commercial sample of concentrated aqueous nitric acid (HNO3) is 18.2% nitric acid base mass and has a density of 1.12 g/mL.

(a) What is the molarity (M) of the HNO3 solution?

(b) What is the molality (m) of the HNO3 solution?

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I know that....

(a) molarity = moles of solute/liters of solution

(b) molality = moles of solute/kg of solvent


But, I dont know how to find the moles of HNO3 (63 amu) with the information I have been given.

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