take the example of carbon monoxide..it was observed that 3 g of carbon combines with 4 g of oxygen.in other words,carbon combines with 4/3 times its mass of oxygen to form carbon
monoxide.
carbon combines with  4/3 times its mass of oxygen to form carbon  .How?????????? i need the answer in simple language for me to understand

mass of 1 atom of carbon = 12 u
mass of 1 atom of oxygen = 16 u

1 molecule of carbon monoxide contains 1 atom of carbon and 1 atom oxygen
 
So, the mass of 1 molecule of CO = 12 + 16 = 28 u,
in which the mass of C and O are present in the ratio of 12 : 16.
Simply 12 : 16, we get 3 : 4.

this shows that Carbon combines with 4/3 times its mass of oxygen to form carbon monoxide.

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