You have 500 mL of a 5.0 M solution of nitric acid HNO3 (63.01 g / mol) dissolved in water. How many grams of nitrogen does the solution contain?

Answer 1

What is the percent N in HNO3? That's
(14/63)*100 = about 22% or so.
mols HNO3 = M x L = 5.0*0.500L = 2.5 mols.
grams HNO3 = 2.5 mols x molar mass = about 160g.
Then about 160 x 0.22 = ?. Don't forget I estimated these numbers.