Stoichiometry
Practice Test
1.
The representation of data on graph that resembles a pizza is a _________.
a.
inverse
b.
bar graph
c.
circle graph
d.
line graph
2.
What is the maximum amount of product that can be produced from a given amount of reactant?
a.
mole ratio
b.
theoretical yield
c.
percent yield
d.
actual yield
3.
Balance the following equation with the smallest whole—number coefficients. How many grams of O
2
will be produced if 23.2 g of XeF
2
reacts with excess water?
XeF
2
+ H
2
O → Xe + HF + O
2
a.
4.42 g
b.
3.31 g
c.
2.19 g
d.
1.10 g
4.
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.
10.3 g
b.
8.6 g
c.
13 g
d.
6.8 g
5.
What mass of SrF
2
can be prepared from the reaction of 10.0 g Sr(OH)
2
with excess HF?
Sr(OH)
2
+ 2HF → SrF
2
+ 2H
2
O
a.
10.0 g
b.
9.67 g
c.
10.3 g
d.
9.82 g
6.
Which of the following numbers is equal to 2.70 x 10
-4
?
a.
270
b.
0.00027
c.
27 x 10
-3
d.
0.675
7.
What is the SI base unit used to measure the amount of a substance?
a.
kilogram
b.
meter
c.
kelvin
d.
mole
8.
Calculate the number of moles of hydrogen atoms in 4.75 mol sulfuric acid.
a.
4.75 mol
b.
33.2 mol
c.
9.50 mol
d.
2.38 mol
9.
How many moles of hydrogen atoms are present in 2.0 moles of ammonia NH(
3
)?
a.
6.0 mol
b.
3.0 mol
c.
2.0 mol
d.
8.0 mol
10.
What is the area in square millimeters of a rectangle that is 7.431 cm long and 23.33 mm wide?
a.
17.34 mm
2
b.
1.734 mm
2
c.
173.4 mm
2
d.
1734 mm
2
11.
What mass of iron is contained in 62.8 grams of pyrite FeS
2
?
a.
40.3 g
b.
31.7 g
c.
58.5 g
d.
29.2 g
12.
What is the scientific law that states that matter is not created or destroyed but only transformed in a chemical reaction?
a.
law of conservation of energy
b.
law of conservation of momentum
c.
law of conservation of mass
d.
law of gravity
13.
What mass of calcium metal could be obtained from 1 kg of limestone that is 50.0% pure CaCO
3
?
a.
0.5 kg
b.
0.2 kg
c.
0.05 kg
d.
0.4 kg
14.
What is the mass of one mole of carbon-12 atoms?
a.
12 grams
b.
6 amu
c.
12 amu
d.
6 grams
15.
How is the slope of a linear graph calculated?
a.
slope = (y
2
– y
1
) / (x
2
– x
1
)
b.
slope = (x
2
– x
1
) / (y
2
– y
1
)
c.
slope = (y
2
– y
1
) x 100
d.
slope = (x
2
– x
1
) / 100
16.
What is the percent yield for the reaction between 9.8 grams of Ca(OH)
2
and 9.8 grams of H
3
PO
4
when 2.5 grams of
Ca
3
(PO
4
)
2
are actually obtained?
3Ca(OH)
2
+ 2H
3
PO
4
→ Ca
3
(PO
4
)
2
+ 6H
2O
a.
27%
b.
9%
c.
19%
d.
36%
17.
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.
HCl
b.
Zn
c.
H
2
d.
ZnCl
2
18.
How many particles are present in one mole of particles?
a.
12
b.
1
c.
6.02 x 10
23
d.
3.0 x 10
8
19.
How many grams of Fe
2
O
3
are present in 0.82 mol Fe
2
O
3
?
a.
65 g
b.
260 g
c.
130 g
d.
195 g
