3. in a sample of 500 nitrogen atoms, two atoms are found to be nitrogen-15, with a mass of
15.000109 each, and 498 atoms are found to be nitrogen-14, with a mass of 14.003074 each.
calculate the atomic mass of nitrogen. (hint: calculate the relative abundances first.)

In a popular classroom demonstration, solid sodium is added to liquid water and reacts to produce hydrogen gas and aqueous sodium hydroxide. part a write a balanced chemical equation for this reaction. express your answer as a chemical equation. identify all of the phases in your answer.

Which of the following represents the ester functional group? a. -coo- b. -cho c. -cooh d. c=o

How many moles are in 123.0 grams of kclo4?