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Mass-Energy Balance
Tro AMA 3
Einstein's famous equation
Eme²
expresses the relationship between energy E, in joules, and mass m, in
kilograms, where c-3.00x10 m/s is the speed of light. The equation is
sometimes expressed as
AB=Ame
where AE is the change in energy for a reaction and Am is the difference in
mass between the reactants and products.
Part A
You carefully clean the teapot and then, out of curiosity, you weigh it. The teapot has a mass of 995g. After some mor
silver is on the surface and exposed to the air
If the teapot were once again to become completely tamished, how much mass Am is converted to energy?
Express your answer to three significant figures and include the appropriate units.
View Available Hints)
Am-20
4Ag(s)+O₂(g)-2Ag,0(s), AH-622 kJ/mol
You have a badly tamished silver teapot. The tamish is a result of the silver metal reacting with the open in the air according to
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Part B
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Looking for some guidance? Lets work through a few related
practice questions before you go back to the real thing
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n
Substance
Units input for part A
%
5
"Co-+Ni+8+7
Cobalt-60 is a radioactive isotope that is commonly used for cancer radiation therapy. The cobat-60 atom decays to the
energy in the form of gamma rays
If you captured the energy from the decay of a 0.380 g pellet of isotopically pure coball-60, how long could you run a 70
The relevant masses are as follows:
Mass
(g/mol)
Y
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G
V
A
D
D
A Study Tools I Constants Periodic Table
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8
U
H
B
To help you work through this
problem, I will ask you a series of
questions, guiding you step by step.
One mole of silver is equivalent to
107.9 g of silver. The solid silver teapot
weights 751g. How many moles of
silver is this? Express your answer to
three significant figures and include
the appropriate units.
"
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