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Density

How many mole...

Question

How many moles of tetrahedral voids present in $2$ cm long iron cube assuming cubic shape is FCC unit cell? Density of iron is $7.0$ g/cc. Its atomic mass is $56$ amu.

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Solution

As we know,
Mass of cube $= V \times d = 8 \times 7.0 = 56$ g
Moles of atom $= \frac{8 \times 7.0}{56} = 1.0$ mol
Moles of tetrahedral voids $=$ twice the of number of atoms $= 2 \times 1. 0 = 2$ mol

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