Section 12.3
Limiting Reactants
Practice Test
1.
The substance that limits the extent of a chemical reaction has a special name. What is this substance called?
a.
limiting reactant
b.
limiting product
c.
excess reactant
d.
excess product
Hint
2.
What mass of SrF
2
can be prepared from the reaction of 8.05 g of Sr(OH)
2
with 3.88 g of HF?
Sr(OH)
2
+ 2HF → SrF
2
+ 2H
2
O
a.
11.7 g
b.
12.2 g
c.
10.5 g
d.
8.32 g
Hint
3.
How many moles of HCl will just react with 0.424 g Ba(OH)
2
?
2HCl + Ba(OH)
2
→ BaCl
2
+ 2H
2
O
a.
4.94 x 10
-3
mol
b.
9.90 x 10
-3
mol
c.
2.48 x 10
-3
mol
d.
1.24 x10
-3
mol
Hint
4.
In the chemical reaction below, 3.27 grams of Zn are reacted with 3.30 grams of HCl. Which component will limit the reaction?
Zn + 2HCl → ZnCl
2
+ H
2
a.
Zn
b.
HCl
c.
ZnCl
2
d.
H
2
Hint
5.
Which reactant in the following reaction is in excess when 9.8 grams of Ca(OH)
2
is reacted with 9.8 grams of H
3
PO
4
?
3Ca(OH)
2
+ 2H
3
PO
4
→ Ca
3
(PO
4
)
2
+ 6H
2
O
a.
Ca(OH)
2
b.
H
3
PO
4
c.
Ca
3
(PO
4
)
2
d.
H
2
O
Hint
6.
What is the maximum amount of Ca
3
(PO
4
)
2
that can be prepared from 9.8 grams of Ca(OH)
2
and 9.8 grams of H
3
PO
4
?
3Ca(OH)
2
+ 2H
3
PO
4
→ Ca
3
(PO
4
)
2
+ 6H
2
O
a.
6.8 g
b.
8.6 g
c.
10.3 g
d.
13 g
Hint
