Calculate the mass in grams of 2.28×1024 molecules of propylamine. The chemical formula for propylamine is C3H9N.

Answer 1

Change molecules into moles, using avogadros number. Then change moles into grams, using the period table for the compound.

C is 12, H is 1, N is 14.

3 carbon means 3 ×12, 9 hydrogen means 9×1, 1 nitrogen means 1×14. Add all together and the mass of the compound is 59.

(2.28×10^24)÷(6.02×10^23)×(59)