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Question

Question: If the unit cell length of sodium chloride crystal is 600pm, then its density will be...

If the unit cell length of sodium chloride crystal is 600pm, then its density will be

A

2.165gm/cm3

B

3.247gm/cm3

C

1.79 gm/cm3

D

1.082 gm/cm3

Answer

1.79 gm/cm3

Explanation

Solution

ρ = n×MmNAa3\frac{n \times M_{m}}{N_{A}a^{3}}

= 4×58.56.023×1023×(6×108)3\frac{4 \times 58.5}{6.023 \times 10^{23} \times \left( 6 \times 10^{- 8} \right)^{3}} = 1.79 g/cc