Mole concept

Radium disintegrates at an average rate of 2.24*10-3 alpha particles per minute. Each alpha particle takes up 2 electrons from the air and become a neutral He atom. After 420 days,He gas collected was 0.5 ml,measured at 27°C and 750 mm Hg. Calculate the avogadro constant.

1 Answers

jit kamdar ·

total alpha particles released=2.24*10-3*60*24*420=x suppose
therefore total atoms released=x
now after 420 days
where p=pressure
n=no. of moles
R=universal gas consntant
from here we calculate n=pvrt
now, in n moles we get x atoms
therefore in 1 mole we get xn atoms :-)

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