Looking to check if these are correct, if not, help figuring out the right answer.

b. How many moles of glucose are in a 455.0g sample? 2.52 c. How many molecules of glucose are in a 455.0g sample? 15.191023 d. How many Carbon atoms are in a 455.0g sample of glucose? 15.121023 Caffeine, a stimulant found in coffee, tea, chocolate, and some medications, contains 49.48% carbon, 5.15% hydrogen, 28.87% nitrogen, and 16.49% oxygen by mass. a. Determine the empirical formula. C4H5N2O b. Caffeine has a molar mass of 194.2g/mol; determine the molecular formula. C8H10N4O2