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Chemistry
Chemistry
Problem
A certain radio isotope
Z
A
X
{}^{A}_{Z}X
Z
A
X
(
t
1
/
2
=
10
t_{1/2} = 10
t
1/2
=
10
day) decays to give
Z
−
2
A
−
4
Y
{}^{A-4}_{Z-2}Y
Z
−
2
A
−
4
Y
. If one g-atom of
Z
A
X
{}^{A}_{Z}X
Z
A
X
is kept in a sealed vessel, how much He will accumulate in 20 day at STP?
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