Question

Aspirin has the formula C9H8O4. How many atoms of oxygen are there in a tablet weighing 360mg?

Answer 1

formula
C9H8O4
constituent elements
carbon
hydrogen
oxygen
atomic mass. no of atoms in molecule
C 12. 1
H. 1. 1
O. 16. 1
mass of the constituent
12*1. 12
1*1. 1
16*1. 16
molecular mass
12+1+16
29
no of mole of oxygen=mass in grams/molecular mass
=16/29
=1.8125
1.8125*6.022*10 raise to 23(avogadros number)
=10.914875
atoms of oxygen