Molecular weight and mole concept

Please label the questions with the appropriate numbers to avoid
confusion.

7.15

The supply of uranium in the United States (and the rest of the world)
is large, but not limitless. By failing to reprocess spend nuclear fuel,
we are discarding a potential source of energy that some European
countries are presently tapping. Is the current American practice
justified? Why is it different from the European practice? List
arguments on both sides of this issue and then take a stand.

7.18

Isaac Asimov pointed out in one of his many books that a human contains
approximately 3.0 X 10 to the 26th power carbon atoms, of which 3.5 X 10
to the 14th power are radioactive carbon –14 atoms. With each breath
you inhale about three and a half million (3.5 X 10 to the 6th power)
C-14 atoms.

Assume that Isaac Asimov’s figures are correct, and that 3.5 X 10 to
the 14th power of the 3.0 X 10 to the 26th power carbon atoms in your
body are radioactive. Calculate the fraction of carbon atoms that are
radioactive carbon-14.

7.20

This question just has to be a couple paragraphs or so (not very long):

The ramifications of adopting a specific model are both biological and
economical. The more stringent linear dose model requires stricter
limits on workers’ acceptable radiation dose limit than the lower dose
model. By using the linear model, are we being “better safe than
sorry� or are we wasting a lot of money protecting ourselves from an
emotional issue without looking at the science behind it?

As a nuclear medicine technician who must operate under the stricter
federal limits for radiation safety at a hospital, write a letter to an
interested friend giving your position on this issue and the reasons for
it.