In a compound made of X and Y,their masses ar | vedclass

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(C) Let the total mass of the compound be $100 \ g$. Since masses are equal,mass of $X = 50 \ g$ and mass of $Y = 50 \ g$.Number of moles of $X = \fra

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$X_2Y_3$

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(C) Let the total mass of the compound be $100 \ g$. Since masses are equal,mass of $X = 50 \ g$ and mass of $Y = 50 \ g$.Number of moles of $X = \frac{50}{30} = \frac{5}{3} \approx 1.67$.Number of moles of $Y = \frac{50}{20} = \frac{5}{2} = 2.5$.Ratio of moles $X:Y = \frac{5}{3} : \frac{5}{2} = 2 : 3$.Empirical formula is $X_2Y_3$.Empirical formula mass $= (2 	imes 30) + (3 	imes 20) = 60 + 60 = 120$.Since the given molecular mass is $120$,the molecular formula is the same as the empirical formula,which is $X_2Y_3$.

In a compound made of $X$ and $Y$,their masses are equal. If the atomic masses of $X$ and $Y$ are $30$ and $20$ respectively,then the molecular formula of the compound will be ......... (Its molecular mass $= 120$).

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