Question

the chemical formula for caffeine is c8h10n4o2 how many grams of carbon are present in a 12.46 gram sample of caffeine? show your work

Answer 1

C8H10N4O2 molar mass = 194.19 g / mol

C molar mass = 12.01 g /mol

8 carbons molar mass = 8 x 12.01 g / mol

                                    = 96.08 g / mol

194.19 g caffeine contains -----------------> 96.08 g carbon

12.46 g caffeine contains ----------------->x g carbon

x = 96.08 x 12.46 / 194.19

x = 6.165 g

mass of carbon present = 6.165 g