Compound of X and Y has the empirical formula XY. Its vapour density is equal to its empirical formula mass. Determine its molecular formula.

Explanation

To determine the molecular formula of the compound XY, we can follow these steps:

### Step 1: Understand the relationship between vapor density and molar mass
The vapor density (VD) of a gas is related to its molar mass (M) by the formula:
\[ \text{VD} = \frac{M}{2} \]

### Step 2: Identify the empirical formula mass
The empirical formula of the compound is XY. The empirical formula mass (E) is the sum of the atomic masses of X and Y. If we denote the atomic masses of X and Y as \( M_X \) and \( M_Y \), then:
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