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A solid having density of 9$$ \times $$10

[Avogadro constant $$ \cong $$ 6 $$ \times $$ 10

^{3}kg m^{–3}forms face centred cubic crystals of edge length $$200\sqrt 2 $$ pm. What is the molar mass of the solid?[Avogadro constant $$ \cong $$ 6 $$ \times $$ 10

^{23}mol^{–1}, $$\pi $$ $$ \cong $$ 3]2

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A compound of formula A

_{2}B_{3}has the hcp lattice. Which atom forms the hcp lattice and what fraction of tetrahedral voids is occupied by the other atoms :3

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Which premitive unit cell has unequal edge lengths (a $$ \ne $$ b $$ \ne $$ c) and all axial angles different from 90

^{o}?4

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At 100

[Atomic Mass of Cu = 63.55 u]

^{o}C, copper (Cu) has FCC unit cell structure with cell edge length of x $$\mathop A\limits^o $$. What is the approximate density of Cu (in g cm^{$$-$$3}) at this temperature?[Atomic Mass of Cu = 63.55 u]

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