Question

A mixture of gases contains $H_2$ and $O_2$ gases in the ratio of 1:4 (w/w) what is the molar ratio of the two gases the mixture?

• A. 1 : 4
• B. 4 : 1
• C. 16 : 1
• D. 2 : 1

Answer 1

The correct option is B 4 : 1

Number of moles of $H_2=\frac{1}{2}$
Number of moles of $O_2=\frac{4}{32}=\frac{1}{8}$
Hence the mole ratio of $H_2$ to $O_2$ = $\frac{1}{2}:\frac{1}{8}=4:1$