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What is the formula of a compound in which the element Y forms ccp Lattice and atoms of X occupy 2/3rd of tetrahedral voids?

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Number of element Y = n, Number of element X = 2 n x\(\frac{2}{3}\) .

As number of tetrahedral void = 2n

X:Y = \(\frac{4n}{3}\):n

Formula = X4Y3

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