Question

A compound of X and Y has equal mass of them if their atomic weight of 30 and 20 respectively then find molecular formula of that compound

Answer 1

The LCM of 30 and 20 is 60.

So, 2 atoms of X and 3 atoms of Y have equal mass of 60.

Hence the molecular formula of the compound is X₂Y₃

Answer 2

Answer:

The molecular formula of the compound is $X_2Y_3$.

Explanation:

Atomic mass of X = 30 g/mol

Atomic mass of Y = 20 g/mol

In compound both of the elements are present in equal masses.

Let the number of atoms of X and Y be  n and m.

$n\times 30 g/mol=m\times 20g/mol$

$n=m\frac{2}{3}$

The molecular formula of the compound can be written as:

$X_nY_y=X_{m\frac{2}{3}}Y_m=X_2Y_3$

The molecular formula of the compound is $X_2Y_3$.