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Question

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 1.12×102mL at STP. The number of αparticles emitted by the sample of Radium in the same time is:

A
6×1017
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B
3×1017
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C
1.5×1017
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D
1.2×1017
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Solution

The correct option is B 3×1017
α particles are charged helium nuclear which give helium atoms in a 1:1 ratio.

22.4 L helium6.023×1023 particles

1.12×105L helium has x particles

x=6.023×1023×1.12×10522.4=3.012×1017

Hence, the correct option is B

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