An α-particle change into a Helium into a Helium atom. In the course of one year the volume of Helium collected from a simple of Radium was found to be 1.12×10
−2
mL at STP. The number of αparticles emitted by the sample of Radium in the same time is:
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α particles are charged helium nuclear which give helium atoms in a 1:1 ratio.
22.4 L helium⟶6.023×10
23
particles
∴1.12×10 ^−5
L helium has x particles
x= 6.023×10 ^23 × 1 .12×10 ^−5 ÷ 22.4
=3.012×10 ^17
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