KCl has the same structure as NaCl. The length of the unit cell is 628pm. The density of KCl is 1.984 g/cm3, and its formula mass is 74.55 amu. Using this information, calculate Avogadro’s number.

The value of Avogadro's number is

Explanation:

NaCl crystallizes as face centered cubic, where Z = 4

To calculate the density of metal, we use the equation:

where,

= density  of KCl =

Z = number of atom in unit cell = 4  (FCC)

M = atomic mass of KCl = 74.55 g/mol

= Avogadro's number = ?

a = edge length of unit cell =    (Conversion factor:    )

Putting values in above equation, we get:

Hence, the value of Avogadro's number is

it should be p1 v1 = p2 v2

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