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The density of lead is 11.35gm …

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The density of lead is 11.35gm and the metal crystalise with fcc unit cell. Estimate the radius of lead atom atomic mass of lead is 207gm

Posted by Gunjan Chaudhary 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Bhavya Sharma 6 years, 11 months ago

For a fcc unit cell , Density = 4×molarmass NA×a3 = 4×207gmol−1 6.02×1023mol−1×a3 =11.35gcm−3 Then a=( 4×207 6.02×1023×11.35cm−3 )1/3 =4.95×10−8cm a √ 2 =4r From geametry r= 4.95×10−8cm 2 √ 2 =1.75×10−8cm So the radius of lead atom is 1.75×10−8cm or 175pm

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