Stoichiometry
Practice Test
1.
How many milliliters are there in 1.0 microliter?
a.
1.0 x 10
-2
mL
b.
1.0 x 10
-4
mL
c.
1.0 x 10
-1
mL
d.
1.0 x 10
-3
mL
2.
If sufficient hydrochloric acid is used to react completely with 48.6 g of magnesium, how much hydrogen will be produced?
2HCl+Mg→MgCl
2
+H
2
SC.B.1.4.2
a.
1 mol
b.
2 mol
c.
6 g
d.
3 g
3.
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
SC.B.1.4.2
a.
8.32 g
b.
11.7 g
c.
10.5 g
d.
12.2 g
4.
How many moles of CO
2
would be produced from 56 moles of O
2
according to the following balanced equation?
2C
2
H
6
+7O
2
→4CO
2
+6H
2
O
SC.B.1.4.2
a.
32 mol
b.
16 mol
c.
224 mol
d.
48 mol
5.
What do the coefficients in the following balanced chemical equation mean?
2H
2
+ O
2
→2H
2
O
a.
2 moles of hydrogen and 1 mole of oxygen in the reactants
b.
2 moles of hydrogen and 1 mole of oxygen in the products
c.
2 moles of oxygen and 1 mole of hydrogen in the products
d.
2 moles of oxygen and 1 mole of hydrogen in the reactants
6.
How is the slope of a linear graph calculated?
SC.H.3.4.3
a.
slope =
x
2
– x
1
/
y
2
– y
1
b.
slope =
y
2
– y
1
x 100
c.
slope =
x
2
– x
1
/ 100
d.
slope =
y
2
– y
1
/
x
2
– x
1
7.
The representation of data on graph that resembles a pizza is a _________.
SC.H.3.4.1
a.
bar graph
b.
circle graph
c.
line graph
d.
inverse
8.
A compound contains sulfur, oxygen, and chlorine. Analysis of a sample showed that it contained by mass 26.95% sulfur and 59.61% chlorine. What is the simplest formula for this compound?
SC.A.2.4.2
a.
SO
2
Cl
2
b.
SOCl
2
c.
SO
2
Cl
d.
SOCl
9.
What is the molar mass of H
2
CrO
4
?
SC.A.2.4.2
a.
52 g
b.
2 g
c.
118 g
d.
64 g
10.
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
SC.B.1.4.2
a.
3.31 g
b.
4.42 g
c.
1.10 g
d.
2.19 g
11.
What mass of iron is contained in 62.8 grams of pyrite FeS
2
?
a.
29.2 g
b.
58.5 g
c.
40.3 g
d.
31.7 g
12.
What is the mass of one mole of carbon-12 atoms?
a.
12 amu
b.
12 grams
c.
6 amu
d.
6 grams
13.
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
SC.B.1.4.2
a.
HCl
b.
Zn
c.
H
2
d.
ZnCl
2
14.
Dimensional analysis is a method of problem-solving that focuses on ________ .
SC.H.3.4.3
a.
error
b.
units
c.
precision
d.
accuracy
15.
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
SC.B.1.4.2
a.
9%
b.
36%
c.
27%
d.
19%
16.
Determine the number of atoms in 3.54 mol S.
SC.A.2.4.2
a.
1.70 x 10
23
b.
1.70 x 10
24
c.
2.13 x 10
24
d.
2.13 x 10
23
17.
What is the percent yield of CO
2
if a reaction using 10.0 g CO with excess O
2
produces 12.8 g CO
2
?
2CO+O
2
→ 2CO
2
SC.B.1.4.2
a.
78.10%
b.
84.40%
c.
76.40%
d.
81.50%
18.
Calculate the number of moles of hydrogen atoms in 4.75 mol sulfuric acid.
SC.A.2.4.2
a.
4.75 mol
b.
2.38 mol
c.
33.2 mol
d.
9.50 mol
19.
What is the SI base unit used to measure the amount of a substance?
SC.A.2.4.2
a.
mole
b.
kelvin
c.
kilogram
d.
meter
