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1 Name: _______________________________________________ EDP#: 403428 General Chemistry II X19B Spring 2012 Final Review HW #2 Due May 14, 2012...

3.
Stellar
nuclear
fusion
begins
with
1H
and
ends
with
56Fe.
Younger
stars
fuse
hydrogen
to
form
4He,
while
older,
more
massive
stars
fuse
helium
to
form
heavier
elements.
Fusion
beyond
56Fe
is
not
possible
because
iron-­‐56
has
the
greatest
binding
energy
per
nucleon.
Calculate
the
binding
energy
per
nucleon
of
56Fe
and
use
it
to
calculate
the
maximum
total
energy
per
mole
of
56Fe
that
could
be
released
through
nuclear
fusion.
What
percentage
of
the
maximum
total
energy
is
released
by
the
formation
4He?
(10
points

1 Name: _______________________________________________ EDP#: 403428 General Chemistry II - X19B - Spring 2012 - Final Review HW #2 - Due May 14, 2012 **REMEMBER TO KEEP THE CORRECT NUMBER OF SIGNIFICANT DIGITS IN YOUR ANSWER** **SHOW YOUR WORK AND CIRCLE YOUR ANSWERS AS APPROPRIATE** 1. Zinc sulfide, ZnS, exists in two main crystal forms. The more stable form, zinc blende, is face-centered cubic with tetrahedral coordination geometry and has density 4.09 g/cm 3 . a.) Use 184 pm for the ionic radius of S 2- to calculate the ionic radius of Zn 2+ . (4 points) b.) What would be the density of a hypothetical form of ZnS that is face-centered cubic with octahedral, instead of tetrahedral, coordination geometry? (3 points) c.) If ZnS had primitive cubic unit cell instead, then what would be its density? (3 points)
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2 Name: _______________________________________________ EDP#: 403428 General Chemistry II - X19B - Spring 2012 - Final Review HW #2 - Due May 14, 2012 **REMEMBER TO KEEP THE CORRECT NUMBER OF SIGNIFICANT DIGITS IN YOUR ANSWER** **SHOW YOUR WORK AND CIRCLE YOUR ANSWERS AS APPROPRIATE** 2. Draw and name all possible isomers (sterioisomers and structural) of [Co(NH 3 ) 4 Cl 2 ]NO 2 . [Hint: remember to include coordination and linkage isomers.] (10 points)
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Iron-56 is abundant in stellar processes, and with a binding energy per nucleon of 8.8 MeV
The mass of Iron -56 is 55.934939 amu, it contains 26 protons and 30 Neutrons
Theoretical Mass of Fe - 56...

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