Question

Aspirin has the formula C9H804. How many atoms Of oxygen are there in a tablet weighing
360 mg?

Answer 1

C9H8O4 = 4 O atoms

180g of aspirin = 4 mole of O atom

1 g of aspirin = 4 /180 mole of O atom

360mg of aspirin = 4/180 × 0.36 mole of O atom

= 0.008 moles of O atom

1 mole of O atom = 6.02 × 10²³ atoms

0.008 mole of O = 0.008 × 6.02 × 10²³ atoms

= 4.82 × 10²¹ atoms