Question

Number of moles of tetrahedral voids present in fcc type structure having 3 moles of atom is

Answer 1

may be it will 2 times the no. of mole of atom means no. of void is equal to 6 mole
since no. of tetrahedral void is equal to the 2 time of number of particle present

Answer 2

The number of moles of tetrahedral voids present in fcc type structure having 3 moles of an atom is 6 moles.

Explanation:

• Face centered cubic fcc structure is a type of atom arrangement which is found in nature
• Here an fcc structure consists of atoms that are arranged in a cube which has a fraction of an atom with six additional atoms which is at the center of each cube face.
• In tetrahedral void -
• FCC unit cell has an ABC ABC type of packing pattern
• It has Zeff as 4 and given 3 moles of the atom
• Number of moles of unit cell = $\frac{3}{4}=0.75$
• Number of tetrahedral voids present in one unit cell =8
• The total number of tetrahedral voids in the 0.75-mole unit cell will be equal to  $0.75$×$8$ =$6$
• 6 moles of tetrahedral voids.