Question

The molecular formula of a compound is $C_2{X}_6$. X is unknown. If the mass ratio of C to X is 4:1 in the compound, find X.

• A. Helium
• B. Sodium
• C. Calcium
• D. Hydrogen

Answer 1

The correct option is D

Hydrogen

Let the mass of the element X be $x$

Since, the mass ratio$=\frac{2\times 12}{6\times x}=\frac{4}{1}$, $x=1$

Hence, X is Hydrogen.