Question

Aspirin, C9H8O4, has a molar mass of 180.2 g/mol. A tablet contains 325 mg(0.325 g) of pure aspirin. Show all work

Answer 1

A.how many moles of aspirin are in one tablet
0.325 g ( 1 mol / 180.2 g ) = 1.80 x 10^-3 mol

B. How many moles of oxygen are in one tablet of aspirin
1.80 x 10^-3 mol C9H8O4 ( 4 mol O / 1 mol C9H8O4) = 7.21 x 10^-3 mol O
 
C. How many atoms of carbon are in one tablet of aspirin 
1.80 x 10^-3 mol C9H8O4 ( 9 mol C / 1 mol C9H8O4 ) ( 6.022 x 10^23 atoms C / 1 mol C ) = 9.76 x 10^21 atoms C

D. How many grams of oxygen in one tablet of aspirin
 7.21 x 10^-3 mol O ( 16 g / mol ) = 0.12 g O