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Chemistry
Chemistry
Problem
An isotope has decay constant
0.693
day
−
1
0.693\,\text{day}^{-1}
0.693
day
−
1
. If
10
g
10\,\text{g}
10
g
of the isotope is present initially, what percentage of the original mass remains after
2
days
2\,\text{days}
2
days
? a)
50
%
50\%
50%
b)
25
%
25\%
25%
c)
38
%
38\%
38%
d)
12.5
%
12.5\%
12.5%
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