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### F.3 Chemical Principle 7th edition

Posted: Thu Oct 03, 2019 4:45 pm
(a) Write the formula for nitric acid. (b) Without doing a calculation, estimate which element in nitric acid occurs with the greater mass percentage.

### Re: F.3 Chemical Principle 7th edition

Posted: Thu Oct 03, 2019 4:50 pm
a) HNO3
b) Oxygen. Hydrogen is approx 1 amu, nitrogen is approx 14 amu, and oxygen is approx 16 amu. Since there are 3 oxygen, it will have a higher mass percent.

### Re: F.3 Chemical Principle 7th edition

Posted: Thu Oct 03, 2019 4:53 pm
For this question, you'll probably have to have known the formula for nitric acid beforehand.
Nitric acid is one of the seven strong acids.

a. Nitric acid = $HNO_{3}$
b. While knowing that...
H = 1.008 grams/mol
N = 14.01 grams/mol
O = 16.00 grams/mol
you can estimate that O has the greatest mass percentage since it has the highest atomic mass and because there are three atoms of O (16x3=total of 48g) in $HNO_{3}$