Question

a sample of cardon dioxide contains carbon and oxygen in the mass ratio 3:8find the formula of carbon dioxide(relative atomic masses: C= 12u, O= 16u​

Answer 1

Answer:

Atomic weight of Carbon atom=8

Atomic weight of Oxygen atom=16

Hence the atomic weight of carbon and oxygen atoms are constant

In CO2

, mass of carbon is 12 whereas that of oxygen is 32. Hence the ratio of their masses are 12:32=3:8

Explanation:

We need to find the molecular mass of carbon dioxide

Molecular mass ofCO2= Molecular mass of carbon + 2 (Molecular mass of oxygen) { 2 atoms of oxygen are present)

Molecular mass of carbon = 12

Molecular mass of oxygen= 16

molecular mass of CO2 = 12 + (16 X 2)

= 12 + 32

= 44 g

Mass of 1 mole (6.023 X 1023 molecules) of CO2 is about 44g.