A scientist collected a sample of ${CO}_{2}$ gas. The total mass of carbon in the sample is 36 g. What is the mass of oxygen in the sample?

(Atomic mass of oxygen is 16 u and that of carbon is 12 u)

64 g

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96 g

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108 g

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128 g

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Solution

The correct option is B 96 g
According to the law of constant proportions, the elements of a chemical compound are always combined together in a fixed proportion.

In a ${CO}_{2}$ molecule, the ratio of the mass of oxygen to that of carbon atoms is given below.

$\frac{A t o m i c m a s s o f o x y g e n}{A t o m i c m a s s o f c a r b o n} =$ $\frac{32}{12}$

So, if total mass of $C O_{2}$ is given to be 36 g, then the mass of oxygen in the sample = $\frac{32}{12} \times$ 36 = 96 g

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A scientist collected a sample of CO2 gas. The total mass of carbon in the sample is 36 g. What is the mass of oxygen in the sample? (Atomic mass of oxygen is 16 u and that of carbon is 12 u)

A scientist collected a sample of ${CO}_{2}$ gas. The total mass of carbon in the sample is 36 g. What is the mass of oxygen in the sample?

(Atomic mass of oxygen is 16 u and that of carbon is 12 u)