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Chemistry
Review of Stoichiometry
Review Test
Review of Stoichiometry
Further Study
Review Test
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Full Book Quiz
1. Which of the following are chemically engineered products?
Glue
Tires
Aspirin
All of the above
2. A mole is a measure of:
Amount of substance
Weight of substance
Mass of substance
6.02×10
^{23}
3. True or False: Only at STP will 1 mole of substance contain
6.02×10
^{23}
particles.
True
False
4. How many inches are there in 18 yards?
54
648
216
12
5. How many atoms are there in 3 moles of
H
_{2}
O
?
3
6.02×10
^{23}
1.806×10
^{24}
5.418×10
^{24}
6. A mole ratio is:
A fraction
A ratio
A conversion factor
All of the above
7. Given the following balanced equation:
N
_{2}
+3H
_{2}
→2NH
_{3}
Which of these is an INCORRECT mole ratio?
8.
4NH
_{3}
(g) + 6NO(g)→5N
_{2}
(g) + 6H
_{2}
O(g)
How many moles of each reactant were there if 13.7 moles of
N
_{2}
(g)
is produced?
10.96 moles
NH
_{3}
(g)
and 16.44 moles NO(g)
2.74 moles
NH
_{3}
(g)
and 16.44 moles NO(g)
3.43 moles
NH
_{3}
(g)
and 5.15 moles NO(g)
54.8 moles
NH
_{3}
(g)
and 82.2 moles NO(g)
9. NaCl,
Cl
_{2}
,
C
_{2}
H
_{6}
O
_{2}
: Which has the greatest GFM?
NaCl
Cl
_{2}
C
_{2}
H
_{6}
O
_{2}
All have equal GFM
10. What is the GFM of
Ca
_{3}
(PO
_{4}
)
_{2}
?
215 grams
215 grams/mole
310 grams
310 grams/mole
11. What is the mass of 2 moles of
H
_{2}
S
?
34 amu
34 grams
68 amu
68 grams
12. What does STP stand for and what are its conditions?
Standard Temperature and Pressure, 0 degrees Celsius, 0 atm
Standard Temperature and Pressure, 0 degrees Celsius, 1 atm
Standard Temperature and Pressure, 25 degrees Celsius, 1 atm
Stone Temple Pilots, condition: totally awesome
13. If I have 1 mole of
H
_{2}
O
, how many L is that?
22.4 L
44.8 L
67.2 L
Not enough information given
14. What is the first step in solving a problem in stoichiometry?
Balance the equation
Convert to moles
Mole ratio
Convert to desired untis
15. Ammonium nitrate decomposes according to the following equation:
NH
_{4}
NO
_{3}
→N
_{2}
+ H
_{2}
O + O
_{2}
Given that you start with 8 moles of
NH
_{4}
NO
_{3}
, how much
O
_{2}
will be produced? (Assume ideal conditions)
8 moles
22.4 Liters
128 grams
256 grams
16.
2Al +3Cl
_{2}
→2AlCl
_{3}
When 0.8 kg grams of aluminum is reacted with excess chlorine gas, how many formula units of
AlCl
_{3}
are produced?
1.78×10
^{22}
1.78×10
^{23}
1.78×10
^{25}
3.57×10
^{25}
17.
Sb
_{2}
S
_{3}
(s) + 3Fe(s)→2Sb(s) + 3FeS(s)
If
3.87×10
^{23}
particles of
Sb
_{2}
S
_{3}
(s)
are reacted with excess Fe(s), what mass of FeS(s) is produced?
157 grams
170 grams
343 grams
314 grams
18.
CO(g) +2H
_{2}
(g)→CH
_{3}
OH(g)
At STP, what volume of
H
_{2}
(g)
is needed to react completely with
8.02×10
^{23}
molecules of CO(g)?
119.4 mL
29.8 L
59.7 L
119.4 L
19.
4Al +4O
_{2}
→2Al
_{2}
O
_{3}
13.2 moles of Al reacts completely with excess
O
_{2}
, how much
2Al
_{2}
O
_{3}
is produced?
26.4 moles
73.92 L
3.973×10
^{24}
particles
283.8 grams
20.
SiO
_{2}
(s) + 3C(s)→SiC(s) + 2CO(g)
At STP, how many kg of
SiO
_{2}
(s)
reacted if 680 mL of CO(g) were produced?
6.68×10
^{-4}
0.668
1.336
668
21. At STP, which is equivalent to 1 mole?
6.02×10
^{23}
particles
22.4 L
GFM
All of the above
22. I combine 75 L of hydrogen gas with excess iodine at STP. The resulting reaction is as follows:
H
_{2}
+ I
_{2}
→2HI
How many HI particles are produced?
6.02×10
^{23}
2.016×10
^{24}
4.03125×10
^{24}
8.0625×10
^{24}
23. You have 4 moles
O
_{2}
and 2 moles of
FeS
_{2}
and are given the following balanced equation:
4FeS
_{2}
+ 11O
_{2}
→2Fe
_{2}
O
_{3}
+8SO
_{2}
Which reactant is the limiting reagent?
FeS
_{2}
O
_{2}
Fe
_{2}
O
_{3}
SO
_{2}
24.
Li
_{3}
N(s) +3H
_{2}
O(l)→NH
_{3}
(g) + 3LiOH(aq)
How many mL of
NH
_{3}
(g)
are produced at STP when
7.88×10
^{24}
molecules of water reacts with 120 grams of
Li
_{3}
N(s)
?
25.6
76.8
97.7
76,800
25. The following equation is balanced:
CaCO
_{3}
+2HCl→CaCl
_{2}
+ CO
_{2}
+ H
_{2}
O
Density is measured in grams/Liter. 345 grams of
CaCO
_{3}
reacts with excess HCl to produce 200 L of
CO
_{2}
. What is the density of the
CO
_{2}
?
0.71 grams/Liter
0.76 grams/Liter
1.12 grams/Liter
760 grams/Liter
26.
CaCO
_{3}
(s) + 176 kJ→CaO(s) + CO
_{2}
(g)
What is the percent yield if 49.6 g of
CaCO
_{3}
(s)
produces 13.1 grams of CaO?
2.28 %
26.4 %
47.1 %
228 %
27. True or False: A percent yield of 90 % - 100 % is common in chemistry.
True
False
28.
2Zn + O
_{2}
→2ZnO
What is the percent yield of this reaction if 14 moles of ZnO are produced from the reaction of 256 grams of
O
_{2}
with excess Zn?
42.9 %
57.1 %
87.5 %
None of the above
29.
2KClO
_{3}
(s)→2KCl(s) + 3O
_{2}
(g)
If the percent yield is 40%, how many atoms of O are produced from
6.02×10
^{23}
formula units of
KClO
_{3}
(s)
?
9.03×10
^{23}
1.806×10
^{23}
1.806×10
^{24}
3.612×10
^{24}
30.
2KClO
_{3}
(s)→2KCl(s) + 3O
_{2}
(g)
At STP,
9.83×10
^{24}
formula units of
KClO
_{3}
(s)
decompose into KCl and 82 L of
O
_{2}
(g)
. What is the percent yield?
7.47 %
14.9 %
44.7 %
89.5 %
31. The amount of heat a substance has at a given temperature and pressure is known as:
Enthalpy
Heat of reaction
Heat of formation
Core temperature
32.
C(s) + O
_{2}
(g)→CO
_{2}
(g) + 393.5 kJ
What kind of reaction is this?
Exothermic
Endothermic
Neither
Both
33.
N
_{2}
(g) + O
_{2}
(g) + 43.2 kcal→2NO(g)
What kind of reaction is this?
Exothermic
Endothermic
Neither
Both
34. What is the atomic mass of magnesium-26?
24 amu
26 amu
24 grams/mole
26 grams/mole
35.
2Mg(s) + O
_{2}
→2MgO(s) + 288 kcal
How much heat is given off when 8.5 grams of magnesium-26 reacts with excess \
O
_{2}
?
47.1 kJ
196.8 kcal
196.8 kJ
393.6 kJ
36.
CaCO
_{3}
(s) + 176 kJ→CaO(s) + CO
_{2}
(g)
How much energy is required to decompose 10.4 moles of
CaCO
_{3}
(
s
)
?
176 kJ
915 kJ
1830 kJ
None of the above
37.
2CO
_{2}
(g) + 43.9 kJ→2CO(g) + O
_{2}
(g)
How many molecules of
2CO
_{2}
(g)
can be decomposed by the addition of 20 kcal of heat energy?
2.73×10
^{23}
5.47×10
^{23}
1.146×10
^{24}
2.293×10
^{24}
38.
SO
_{3}
(g) + H
_{2}
O(l)→H
_{2}
SO
_{4}
(aq) + 129.6 kJ
At STP, if 540 kJ is released, what volume of
SO
_{3}
(g)
was originally added?
24.1 mL
24.1 L
93.3 L
1.57×10
^{6}
L
39. True or False: The state (s,l,g,aq) of all reactants and products MUST be given in an enthalpy reaction.
True
False
40.
2Cl(g)→C
_{2}
What is the standard heat of formation for the reaction?
H
_{f}
= 0
Impossible to find since it is impossible to directly measure the absolute enthalpy of a substance
Impossible to find since not enough information is given
41. Which is the correct equation for heat of reaction?
δH
=
δH
(products) -
δH
(reactants)
δH
=
δH
(reactants) -
δH
(products)
δH
=
δH
_{f}
(products) -
δH
_{f}
(reactants)
δH
=
δH
_{f}
(reactants) -
δH
_{f}
(products)
42.
2NO
_{2}
(g)→2NO(g) + O
_{2}
Calculate the change in enthalpy for this equation given the following two heats of formation:
δH
_{f}
NO
_{2}
(g) = 33.85 kJ / mole
δH
_{f}
NO(g) = 90.37 kJ / mole
113.04 kJ
56.52 kJ
-113.04 kJ
-56.52 kJ
43.
2SO
_{2}
(g) + O
_{2}
(g)→2SO
_{3}
(g)
Find the heat of reaction for this equation given the following two heats of formation:
δH
_{f}
SO
_{2}
= -296.8 kJ / mole
δH
_{f}
SO
_{3}
= -395.7 kJ / mole
141.97 kcal
-23.7 kcal
-141.97 kcal
-593.4 kcal
44.
2SO
_{2}
(g) + O
_{2}
(g)→2SO
_{3}
(g)
Find the heat of reaction for this equation given you have 4.5 moles of
SO
_{2}
(g)
, excess oxygen, and the following two heats of formation:
δH
_{f}
SO
_{2}
= -296.8 kJ / mole
δH
_{f}
SO
_{3}
= -395.7 kJ / mole
-319.4 kcal
319.4 kcal
-141.97 kcal
-63.1 kcal
45. I had 1 mole of NaCl and I put it in 2 L of solution. Which of the following is FALSE?
I have a 0.5 M solution of
Na
^{+}
I have a 0.5 M solution of
Cl
^{-}
I added 58 g of NaCl to the solution
I have 22.4 L of solution
46.
3CaCO
_{3}
(s) + 2H
_{3}
PO
_{4}
(aq)→Ca
_{3}
(PO
_{4}
)
_{2}
(aq) + 3CO
_{2}
(g) + 3H
_{2}
O(l)
How much
3CaCO
_{3}
(s)
was added if 650 mL of
2.5 M Ca
_{3}
(PO
_{4}
)
_{2}
(aq)
was produced?
1.625 grams
4.875 grams
1.625 moles
4.875 moles
47. Can the normality of a solution be numerically equivalent to its molarity?
Yes
No
48. I have a 1
N
solution of
Ca(OH)
_{2}
and a 1 M solution of NaCl. Which of the following are equivalent?
Particles of
OH
^{-}
and particles of
Cl
^{-}
Grams of
Ca(OH)
_{2}
and grams of NaCl (before dissolving)
Moles of
Ca
^{2+}
and moles of
Cl
^{-}
Not enough information is given
49.
2P
_{2}
O
_{5}
+6H
_{2}
O→4H
_{3}
PO
_{4}
After 0.32 moles of
P
_{2}
O
_{5}
is dropped in a beaker of water, 500 mL remains. What is the normality of the resulting solution?
0.00384
N
1.28
N
3.84
N
7.69
N
50.
2Na
_{2}
O
_{2}
(s) + 2H
_{2}
O(l)→O
_{2}
(g) + 4NaOH(aq)
After 27.6 grams of
Na
_{2}
O
_{2}
(s)
is dropped into a beaker of water, 80 mL remains. What is the normality of the resulting solution?
0.0044
N
0.0089
N
4.4
N
8.8
N
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