To Do

Finish reading Chapter 3.

Text homework for Chapter 3.

Quiz #2 on Friday, February 13

Lon-Capa assignment #2.
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N2(g) + H2(g)  NH3(g)
2
Method 3: ICE Table




Set up ICE Table [Initial, Change, End].
Amounts must be in terms of number
of moles.
At least one reactant is completely used
up (goes to zero at End).
Change row: same ratio as the
balanced equation.
N2(g) + H2(g)  NH3(g)
4
Clicker Question
How much ammonia (NH3) can be produced by
reacting 6.0 mol of nitrogen gas with 6.0 mol
of hydrogen gas?
a)
b)
c)
d)
e)
2.0 mol
4.0 mol
6.0 mol
12.0 mol
I don’t know
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Determine Number of Moles



Use mass and molar masses. [Chapter 3]
Use volume and concentration for
solutions. [Chapter 4]
Use pressure, volume, and temperature
for gases. [Chapter 5]
A Question for You…
A 5.000 g sample of copper reacts with
oxygen in the air to form 5.629 g of an
oxide of copper.
Determine the name of the product.
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Problem Solving Approach

What are we trying to solve? That is
“where are we going?”



What does this mean?
What do we know? That is, “where have
we been?”
What procedures do we know? That is,
“how do we get there?”
Requires knowledge and understanding!
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Chapter 3: #170
A 2.25-g sample of scandium metal
is reacted with excess hydrochloric
acid to produce 0.1502 g hydrogen
gas.
What is the formula of the scandium
chloride produced in the reaction?
9