Determining percent of nitrate in molar solution?

Question

Nitric acid has a molarity of 6.00M. I would like to prepare a 0.010M solution of nitric acid. What will be the percentage of nitrate in my final solution? (density = 1.00g/mL)

Answer 1

0.010M solution of nitric acid has 0.010 moles of nitrate per litre

find grams of nitrate in that litre, using molar mass:

0.010 moles  nitrate @ 62.0 g/mol = 0.62 grams nitrate

find mass of that litre:

1000 ml @ 1.00g/ml = 1000 grams

Find % nitrate in the solution:

(0.62 grams nitrate / 1000 g solution) (100) = 0.062 %

your answer is 0.062 % nitrate

(2 sig figs)