A compound of $X$ and $Y$ has the empirical formula $X Y_{2}$ . Its vapour density is equal to its empirical formula weight. Determine its molecular formula.

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Solution

A compound of $X$ and $Y$ has the empirical formula $X Y_{2}$ . Its vapour density is equal to its empirical formula weight.
The molecular weight is twice its vapour density.
So the molecular weight is twice its empirical formula weight.
Its molecule formula is $2 \times X Y_{2} = X_{2} Y_{4}$ .

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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.

A compound of X and Y has the empirical formula XY2. Its vapour density is equal to its empirical formula weight. The molecular weight is twice its vapour density.So the molecular weight is twice its empirical formula weight.Its molecule formula is 2×XY2=X2Y4.

A compound of $X$ and $Y$ has the empirical formula $X Y_{2}$ . Its vapour density is equal to its empirical formula weight. Determine its molecular formula.

A compound of $X$ and $Y$ has the empirical formula $X Y_{2}$ . Its vapour density is equal to its empirical formula weight.
The molecular weight is twice its vapour density.
So the molecular weight is twice its empirical formula weight.
Its molecule formula is $2 \times X Y_{2} = X_{2} Y_{4}$ .