Question

How many atoms of oxygen are there in the table of weighing of 360 mg of aspirin

Answer 1

The relative molecular mass of C9H8O4: = 12x9+1x8+16x4= 180
C H O

Ratio of C:H:O = 108:8:64 = 27:2:16 total ratio is 45

The mass of oxygen is 16/45 ----> 16/45 x 360 mg = 128 mg

Moles of oxygen = mass/molar mass = 128/16 = 8 moles

Avagadro's law: In 1 mole of a substance, there is 6.023 x 10^23 atoms.

Therefore in 8 moles there will be, (8 x 6.023 x 10^23)

= 4.8184 x 10^24 atoms

Hope it helps...