1.

A compound AB has a cubic structure and molecular mass 99. Its density is 3.4 g cm^(-3) . What is the length of the edge of the unit cell ?

Answer»

Solution :Let the EDGE length of each edge = a cm
Volume of unit CELL `= a^3 cm^3`
Density (d) = `3.4 g cm^(-3)`
Number of ATOMS per unit cell (Z) for simple cubic = 1
Molar mass (M) = 99 g `"mol"^(-1)`
Density , d `= (ZM)/(N_A xx a^3)`
or `a^3 = (ZM)/(d xx N_A) = (1 xx 99)/(3.4 xx 6.02 xx 10^(23)) cm^3`
`= 4.84 xx 10^(-23) cm^3`
`a = 3.64 xx 10^(-8) cm = 364 `pm


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