Mole ConceptHard

Question

When x g carbon is burnt with y g oxygen in a closed vessel, no residue is left behind. Which of the following statement is correct regarding the relative amounts of oxygen and carbon?

Options

A.y/x must be less than 1.33.
B.y/x must be greater than 1.33.
C.y/x must be greater than 2.67.
D.y/x must lie between 1.33 and 2.67.

Solution

$C + \frac{1}{2}O_{2} \rightarrow CO$

12 g 6 g

C + O2 → CO2

12 g 32 g

∴x g 2.67x g

Hence, 1.33x ≤ y ≤ 2.67x

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