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VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: DoingItNow on August 25, 2013, 05:01:03 pm

Title: Chemistry - Nitric Acid Question
Post by: DoingItNow on August 25, 2013, 05:01:03 pm

Concentrated nitric acid has a concentration of approximately 15.8M and a purity of 70%. The molecular weight of HNO3 is 63.01g/mol
How much of HNO3 (in grams) would you expect in 10mL of pure HNO3?

Title: Re: Chemistry - Nitric Acid Question
Post by: lzxnl on August 25, 2013, 05:40:45 pm

Quote from: DoingItNow on August 25, 2013, 05:01:03 pm

Concentrated nitric acid has a concentration of approximately 15.8M and a purity of 70%. The molecular weight of HNO3 is 63.01g/mol
How much of HNO3 (in grams) would you expect in 10mL of pure HNO3?

You're given the molar concentration, the purity and the molecular mass (not weight!)
Concentration * volume = number of moles
Number of moles * molecular mass = mass
Then multiply by 70% to get how much you actually get.

Title: Re: Chemistry - Nitric Acid Question
Post by: DoingItNow on August 25, 2013, 06:14:35 pm

Thanks. You confirmed what I thought.