Question

In a compound Carbon and Oxygen react in a ratio 3: 8 by mass to form carbon dioxide. What mass of oxygen is required to repeated to react completely with 9 g Carbon?

plz answer with full steps......

Answer 1

Carbon and oxygen reacts in a ratio 3:8 by mass to form Carbon dioxide

Hence the required reaction is ;

C + O2 --> CO2

Carbon : Oxygen = 3 : 8

Due to law of constant proportion, the mass ratio in which the reactants will react will remain constant.

Carbon --> 9 g
Oxygen --> ?

C : O2 = 3:8
9 : O2 = 3:8

9/O2 = 3/8

Mass of oxygen required
= (9/3)×8
= 3×8
= 24 g
______________________

Answer 2

Given ratio of carbon and Oxygen by mass is 3:8

The mass of carbon is 9g

Let's think the mass of Oxygen is X g

Now,

C + O2 = CO2

According to the law of constant proportion,

Mass of carbon / Mass of Oxygen = 3 /8

9 / X = 3 / 8

or, X = 9 × 8 / 3

or, X = 72/ 3

or, X = 24 g

So, 24 g Oxygen is required.

Hope it helps.