Question

as per the law of Definite proportion carbon and oxygen combine in the ratio of 3:8. compute the mass of Oxygen gas that would be required to react completely with 6gm carbon

Answer 1

Well, from the question we know that ratio of mass of carbon to oxygen is 3:8

So, Mass of carbon : Mass of oxygen = 3:8

Let suppose mass of oxygen required to react completely with 9 grams of carbon is "x"

So, we can say that   6/x =3/ 8

Thus, X = (6*8)/3 = 48/3 = 16 grams

Hence 16 grams of oxygen would be required to react completely with 6 grams of carbon. 

Answer 2

16 grams is the answer..