Download Stoichiometry worksheet KEY

Name: _____________________________________________ Date: _____ Period: ____
Honors Chemistry
Stoichiometry Worksheet
Part 1. Do at least 6 stoichiometry problems. Remember to follow sig
figs, and include units. Show your work.
1)
2H2 + O2 → 2H2O
a) How many grams of water could you make with 3 g of O2?
3 g H2O (3.375 g H2O)
b) How many grams of water could you make with 0.5 g of H2?
5 g H2O
(4.5 g H2O)
________________________________________________________________________
2)
2NaOH + Cl2 → NaOCl + NaCl + H2O
a) How many grams of NaOH are needed to react with 25.0 g Cl2?
28.2 g NaOH
b) How many grams of sodium chloride will be produced from 25.0 g Cl2?
20.6 g NaCl
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3)
2HgO → 2Hg + O2
a) How many grams of mercury and how many grams of oxygen are
formed from 45.5g HgO?
42.1 g Hg
3.35 g O2
b) How many grams of HgO would you need to make 33.3g O2?
451 g HgO
4)
Fe2O3 + 3CO→ 2Fe + 3CO2
a) How many grams of carbon monoxide are needed to react with 3.25 g
of Fe2O3?
1.14 g CO
b) How many grams of CO are needed to react with 6.81 grams of iron
(III) oxide?
3.58 g CO
5) TiCl4 + O2 → TiO2 + 2Cl2
a) How many grams of titanium dioxide can be produced from 5.60 g
titanium (IV) chloride?
2.36 g TiO2
b) How many grams of titanium (IV) chloride are needed to produce 12.3
g of titanium dioxide?
29.2 g TiCl4
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6) Acetylene gas, C2H2, is produced by adding water to calcium carbide,
CaC2.
CaC2 + 2H2O → C2H2 + Ca(OH)2
a) Balance the chemical equation listed above.
b) How many grams of Ca(OH)2 are produced when 0.89 mol of C2H2 is
produced?
66 g Ca(OH)2 (65.86 g Ca(OH)2)
c) How many grams of C2H2 are produced by adding water to 5.00 g of
CaC2?
2.03 g C2H2
Challenge
7) The combustion of acetylene gas is represented by this equation.
2 C2H2 + 5 O2 → 4 CO2 + 2 H2O
a) Balance the chemical equation listed above.
b) How many grams of CO2 are produced when 52.0 g of C2H2 burn?
176 g CO2
c) How many grams of H2O are produced when 52.0 g of C2H2 burn?
36.0 g H2O
d) How many grams of O2 are required to completely burn 52.0 g of
C2H2?
160 g O2
e) Use the answers from questions b, c, and d above to show that this
equation obeys the law of conservation of mass.
Mass of reactants = mass of products
(52.0 g C2H2 + 160 g O2) = (176 g CO2 + 36.0 g H2O)
212 g reactants = 212 g products
8) Hydrogen and chlorine react to form hydrogen chloride.
H2 + Cl2 → 2 HCl
a) If you have 3.56 g of hydrogen, and 8.94 g chlorine, how much
hydrogen chloride can you make? (Hint: One of them will be used
completely, the other will have leftovers, find which is which, then do
the stoichiometry.)
9.19 g HCl
b) Which reactant will be used up completely (in 8a)?
Cl2
c) Which reactant will have leftovers?
H2
d) How much of the reactant will be left at the end of the reaction?
3.31 g H2
Part 2 – Balance at least 5 of the reactions below and classify the
reaction as: synthesis (S), decompositon (D), combustion (C), single
replacement (SR), or double replacement (DD).
DR
1.
_____ FeCl3 + 3 KOH →
_____ Fe(OH)3
+
3 KCl
S
2.
_____ Li2O + _____ H2O
S
3.
_____ Ni
D
4.
DR
5.
DR
6.
_____ PbCl2 + _____ Li2SO4 → 2 LiCl + _____ PbSO4
SR
7.
2K
S
8.
D
9.
3 CH4 → _____ C3H8
DR
10.
_____ FeS + 2 HCl
C
11.
S
12.
_____ Mg + _____ Cl2 → _____ MgCl2 Balanced
D
13.
2 H2O2 → 2 H2O +_____ O2
SR
14.
DR
15.
→ 2 LiOH
+ 4 CO → _____ Ni(CO)4
_____C6H6 → 6 C
+ 3 H2
_____ PbCl2 + _____ K2SO4
+
_____ CaO
2 H2O →
→ _____ PbSO4
2 KOH
+ _____ H2O
+ 2 KCl
+ _____ H2
→ _____ Ca(OH)2 Balanced
+ 2 H2
→ _____ FeCl2
+ _____ H2S
_____ C6H12O6 + 6 O2 → 6 CO2 + 6 H2O
2 AgNO3 +_____ Zn → _____ Zn(NO3)2 + 2 Ag
_____ Pb(NO3)2 + 2 NaOH → 2 NaNO3 + _____ Pb(OH)2
Part 3. Complete at least 5 rows in the data table below. Show your
work on the back of this page.
Name
Formula
sodium nitrate
NaNO3
Molar Mass
(g/mol)
85 g/mol
Mole Conversion
5.0 g = ? mol
0.059 mol NaNO3
potassium
KOH
56 g/mol
hydroxide
calcium sulfate
12.3 g = ? mol
0.220 mol KOH
CaSO4
136 g/mol
3.52 mol = ? g
479 g CaSO4
carbon dioxide
CO2
44 g/mol
2.10 mol = ? g
92.4 g CO2
lead (IV) oxide
PbO2
239 g/mol
378 g = ? mol
1.58 mol PbO2
sulfur dioxide
SO2
64 g/mol
0.510 mol = ? g
32 g SO2
magnesium
MgF2
62 g/mol
fluoride
iron (III) sulfide
21.5 g = ? mol
0.347 mol MgF2
Fe2S3
208 g/mol
0.25 mol = ? g
51.9 g Fe2S3
tin (II) chloride
SnCl2
193 g/mol
35 g = ? mol
0.18 mol SnCl2
sodium
phosphate
Na3PO4
164 g/mol
1.49 mol = ? g
244 g Na3PO4