Question

What is the ratio of the empirical formula mass to the molecular formula mass of benzene?

• A. $1:6$
• B. $2:3$
• C. $6:1$
• D. $3:2$

Answer 1

The correct option is A $1:6$

Molecular formula of benzene $=C_6{H}_6$
Molecular formula mass of benzene $=78$
Empirical formula of benzene $=CH$
Empirical formula mass of benzene $=13$

$\therefore \frac{\text{empirical formula mass}}{\text{molecular formula mass}}=\frac{13}{78}=1:6$