A compound formed by elements \( X \) and \( Y \) has cubic unit cells in which \( X- \) atoms a...

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A compound formed by elements \( X \) and \( Y \) has cubic unit cells in which \( X- \) atoms are at the corners of the cube and \( Y \) - atoms are at the face centre. What is the formula of the compound? If the atomic weight of \( X \) and \( Y \) are 10 and 15 respectively, then find out the no of unit cell present in \( 20 \mathrm{gm} \) of compound.
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