KEAM 2016 Physics and Chemistry Paper

‌

Z×M

a3×NA

Z= contribution factor
r mass of particle
a= edge length
ρ= density of crystal
adro's number
=6×1023
g∕cm3
(crystal has bcc structure)
‌

×a3×NA

Z

=‌‌‌

4×(500×10−10)3×6×1023

2

‌

4×(5)3×6×10−1

2

=‌‌‌

4×125×6×10−1

2

‌

300

2

=150gmol−1
s of the element (in gmol−1 ) is 150 .