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bcc संरचना के एक तत्व का परमाणु द्रव्यमान 500 तथा घनत्व 2.81 g/cmहै। एकक कोष्ठिका की कोर लम्बाई ज्ञात कीजिए।

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z = 2 

M = 50 g/mol

d = 2.81 g/cm3

NA = 6.022 x 1023 mol-1

a = ?

परमाणु द्रव्यमान

या a3 = 5.91 x 1023

या a3 = 59.1 x 10-24

दोनों तरफ log लेने पर,

log3 = log (59.1 x 1024

या 3 log a = log 59.1 + log10-24 

या 3 log a = 1.7716 - 24 

या 3 loga = 22.2284

या imm

∴loga = -7.4095 

Antilog लेने पर

a = 3.8 x 10-8 cm 

a = 380 x 10-10 cm

a = 380pm 

एकक कोष्ठिका की कोर लम्बाई = 380 pm

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