Percentage compostion of carbon in caco3

Ca = 40.08 amu
C = 12.01 amu
O = 16 * 3 = 48 amu

40.08 + 12.01 + 48 = 100.09 total amu

12.01 / 100.09 = 0.1199 * 100 = about 12% C

To find percent composition carbon you do

12.01 amu divided by the total amu of compound times 100..

amu is just the atomic mass number of the element/compound

The ratio of mass of sulfur atom to mass of oxygen atom in sulfur dioxide is 1: 1.

Explanation:

Law of constant proportion states that In a chemical substance the elements are always present in definite proportions by mass. This law is also known as 'Law of definite proportions '.

Mass of 1 atom of sulphur = 32 g

Mass of 1 atom of oxygen = 16 g

Mass of 2 atoms of oxygen =

In formation of , 1 atom of sulfur combines with 2 atoms of oxygen and thus the mass ratio will be 32: 32= 1:1 .

Thus the ratio of mass of sulfur atom to mass of oxygen atom in sulfur dioxide is 1: 1.