Question

The atomic mass of an atom of carbon is 12 amu, and the atomic mass of an atom of oxygen is 16 amu. To produce CO2, 16 g of oxygen combine with 12 g of carbon. To produce CO2, 32 g of oxygen combine with 12 g of carbon. The ratio of the mass of oxygen in CO2 to the mass of oxygen in CO is A 8:3. B 1:1. C 2:1. D 1:2.

Answer 1

Answer : The correct option is, (C) 2 : 1

Explanation : Given,

Atomic mass of carbon = 12 amu

Atomic mass of oxygen = 16 amu

To produce $CO$, 16 g of oxygen combine with 12 g of carbon. That means,

Mass of oxygen in CO = 16 g

Mass of carbon in CO = 12 g

To produce $CO_2$, 32 g of oxygen combine with 12 g of carbon. That means,

Mass of oxygen in $CO_2$ = 32 g

Mass of carbon in $CO_2$ = 12 g

Now we have to determine the ratio of the mass of oxygen in $CO_2$ to the mass of oxygen in $CO$.

$\frac{\text{Mass of O in }CO_2}{\text{Mass of O in }CO}=\frac{32g}{16g}$

$\frac{\text{Mass of O in }CO_2}{\text{Mass of O in }CO}=\frac{2}{1}$

Therefore, the ratio of the mass of oxygen in $CO_2$ to the mass of oxygen in $CO$ is, 2 : 1