A compound of X and Y has the empirical formula XY2 Its vapour density is equal to its empirical formula weight. Determine its molecular formula.

Explanation

To determine the molecular formula of the compound with the empirical formula XY2, we can follow these steps:

### Step 1: Calculate the Empirical Formula Weight
The empirical formula is XY2. To find the empirical formula weight, we need to know the atomic weights of X and Y. Let's denote the atomic weight of X as \( M_X \) and the atomic weight of Y as \( M_Y \).

The empirical formula weight (EFW) can be calculated as:
\[
\text{EFW} = M_X + 2 \times M_Y
...