What is the formula of a compound in which the element $Y$ forms ccp lattice and atoms of $X$ occupy $1 / 3^{r d}$ of tetrahedral voids?

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Solution

No. of Y ccp atom = $1$

No. of tetrahedral void = $2$

No. of atom= $2 \times 1 / 3$ = $2 / 3$

The ratio of $X : Y = 2 / 3 : 1$

Formula of compound : $X_{2} Y_{3}$

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What is the formula of a compound in which the element Y forms ccp lattice and atoms of X occupy 1/3rd of tetrahedral voids?

No. of Y ccp atom =1No. of tetrahedral void =2No. of atom=2×1/3 =2/3The ratio of X:Y=2/3:1Formula of compound :X2Y3

What is the formula of a compound in which the element $Y$ forms ccp lattice and atoms of $X$ occupy $1 / 3^{r d}$ of tetrahedral voids?

No. of Y ccp atom = $1$

No. of tetrahedral void = $2$

No. of atom= $2 \times 1 / 3$ = $2 / 3$

The ratio of $X : Y = 2 / 3 : 1$

Formula of compound : $X_{2} Y_{3}$