Question

Equal weight of $X$ (At. wt. = 36) and $Y$ (At. wt. = 24) are reacted to form the compound $X_2{Y}_3$. Then:

• A. $X$ is the limiting reagent
• B. $Y$ is the limiting reagent
• C. no reactant is left over and mass of $X_2{Y}_3$ formed is double the mass of $X$ taken
• D. none of these

Answer 1

Answer: (C)

no reactant is left over and mass of $X_2{Y}_3$ formed is double the mass of $X$ taken

To form one molecule of $X_2{Y}_3$, two atoms of $X$ and three atoms of $Y$ will be needed.

It means $36\times 2=72amu$ of $X$ and $24\times 3=72amu$ of Y will be needed to form, $144amu$ of $X_2{Y}_3$.

So, the correct option is $C$