Question

32P is a radioactive isotope with a half-life of 14.3 days. If you currently have 10.1 g of 32P, how much 32P was present 4.00 days ago?

Answer #1

32P is a radioactive isotope with a half-life of 14.3 days. If
you currently have 30.9 g of 32P, how much 32P was present 4.00
days ago?
in grams

32P is a radioactive isotope with a half-life of 14.3 days. If
you currently have 75.7 g of 32P, how much 32P was present 6.00
days ago?

32P is a radioactive isotope with a half-life of 14.3 days. If
you currently have 86.3 g of 32P, how much 32P was present 3.00
days ago?

32P is a radioactive isotope with a half-life of 14.3 days. If
you currently have 62.9 g of 32P, how much 32P was present 6.00
days ago?

32P is a radioactive isotope with a half-life of 14.3 days. If
you currently have 89.5 g of 32P, how much 32P was present 8.00
days ago?

32P is a radioactive isotope with a half-life of 14.3 days. If
you currently have 82.7 g of 32P, how much 32P was present 5.00
days ago?
Please show detailed steps

The radioactive isotope 32P decays by first-order kinetics and
has a half-life = 14.3 days. How many atoms of a 1.0000 ug sample
of 32P would decay in 1.0000 second? (Assume 1 decay per atom.)

1. Given that a freshly prepared radioactive isotope has a
half-life of 10 days, the percentage of it remaining after 30 days
is
A
30.0 %.
B
10.0 %.
C
12.5 %.
D
72.5 %.
2. During a second half-life, the original
material has decayed
A
25%.
B
50%.
C
75%.
D
100%.

A certain radioisotope has a half-life of 10.1 days. What
percentage of an initial sample of this isotope remains after 37
days?

The half-life of a radioactive isotope represents the average
time it would take half of a collection of this type of nucleus to
decay. For example, you start with a sample of 1000 Oxygen-15 (15O)
nuclei, which has a half-life of 122 seconds. After 122 seconds,
half of the 15O nuclei will have decayed into Nitrogen-15 (15N)
nuclei. After another 122s, half of the remaining Oxygen nuclei
will have also decayed, and so on. Suppose you start with 4.00×103
15O...

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