Drill:

1
Drill

• How many atoms are in
• 2.5 kg C2H4O2?

2
Stoichiometry

• The quantitative study of chemical reactions

3
Stoichiometric Steps

• Set up balance rxn
• Change stuff given to moles
• Change moles given to ask
• Change whats asked for to the proper unit

4
Step 1

• Determine products of a reaction if they are not
  given
• Balance the reaction

5
Step 2

• Use molar conversion to change whatever is given
  to moles

6
Step 3

• Use the molar ratio from the balanced reaction to
  convert the moles of what is given to the moles
  of whats asked for.

7
Step 4

• Use molar conversions to change the moles of what
  is asked for to the proper unit

8
Calculate the volume of NH3 formed at STP when
6.0 kg of H2 react with excess N2 to form NH3
9
HW Calculate the number of molecules of oxygen
gas required to burn3.0 ng of C5H10O5
10
Chm II Calculate the mass of Lead(II)iodide
formed when 66.2 g of lead (II)nitrate is
combined with excess potassium iodide
11
AP Calculate the mass of solid product formed
when 66.2 g of lead (II)nitrate is combined with
excess potassium iodide solution
12
Chm II Calculate the mass of MgCO3 formed when
18.4 g of MgBr2 is combined with a solution
containing excess K2CO3.
13
AP Homework

• Problem 60
• Page 78

14
Chm II Homework

• Problem 22
• Page 114

15
AP Calculate the mass of solid product formed
when 18.4 g of MgBr2 is combined with a solution
containing excess K2CO3.
16
Chm II Calculate the volume at STP of CO2 formed
when 16.8 g of MgCO3 is decomposed creating CO2
MgO.
17
AP Calculate the volume at STP of gas formed
when 16.8 g of MgCO3 is decomposed by heat.
18
Limiting Reactant

• The reactant that gets used up
• The reactant that determines the amount of
  product formed

19
Excess Reactant

• The reactant that Does Not get used up

20
Stoichiometry with Multiple Reagents

• Perform same steps for all reactants
• Choose least amount of product

21
Calculate the mass of glucose (C6H12O6) formed
when 880 g of carbon dioxide is combined with 720
g of water in photosynthesis
22
Chm II Calculate the mass of BaSO4 formed when
104 g of BaCl2 is combined with 250 mL 1.00
M(mole/L) K2SO4
23
AP Calculate the mass of solid formed when 104 g
of BaCl2 is combined with 250 mL 1.00 M K2SO4
24
AP Drill Calculate the mass of solid formed when
26.1 g of Ba(NO3)2 is combined with 120 mL 1.00 M
K2SO4
25
Drill Calculate the of molecules of NH3 formed
when4.0 mg of H2 react with 1.12 mL of N2 gas at
STP.
26
Chm II Homework

• Work the problem attached to Polys website

27
Theoretical Yield

• The amount determined through stoichiometry
• The amount solved for on paper

28
Experimental Yield

• The amount obtained in the lab
• Actual yield

29
Percent yield

• Yield
• (Exp/Theo) x 100

30
68 g NH3 was obtained in lab when 140 g of N2
reacts with excess H2. Calculate percent yield.
31
510 g PH3 was obtained when 0.62 kg of P4 reacts
with excess H2. Calculate percent yield.
32
Chm II Homework

• Problem 41
• Page 115

33
Determine the volume of O2 released at STP when
32 kg of Fe2O3 is purified with an 80.0 yield
making Fe O2
34
Calculate the volume of oxygen gas at STP
required to burn 12 kg of erythrose (C4H8O4)
35
Drill Determine the of molecules of PH3 formed
at STP when 1.24 g P4 reacts with 672 mL of H2
36
Calculate the mass of BaSO4 formed when 41.6 g of
barium chloride is added to 250 ml of 0.40 M
potassium sulfate giving a 50.0 yield
37
Chm II Homework

• Problem 105
• Page 120

38
CHM II HW

• Work the problem attached to Polys website

39
Chm II

• Test on Monday

40
Calculate the mass of CaSO4 formed when 2.00 g of
calcium bromide is added to 75 mL of 0.40 M
sodium sulfate
41
Drill Determine the volume of CO2 formed at STP
when 1.62 g Ca(HCO3)2 is decomposed forming CaO,
CO2, H2O
42
Chm II

• Test on Monday

43
3.67 g of lead(II)bromide was obtained when 33.1
g of lead(II)nitrate was added to 1500 mL 0.10 M
potassium bromide. Calculate the yield the
molarity of all ions remaining in the solution.
44
Drill 3.67 g of PbBr2 was obtained when 33.1 g
of Pb(NO3)2 was added to 1500 mL of 0.10 M
NaBr. Calculate the yield.
45
Calculate the volume in mL of oxygen gas at STP
required to burn 50.0 mg C5H8O2
46
Calculate the volume of gaseous product formed
when 2.24 L of F2 is bubbled through a 375 mL
solution 0.20 M KCl
47
Calculate the volume in mL of gaseous products
formed at STP when 6.0 mg of C2H6 is burned in
excess oxygen
48
33.1 g of Pb(NO3)2 was added to 1500 mL 0.10 M
KI. Calculate mass of PbI2 formed.
49
Calculate the volume of gaseous product formed
when 4.2 kg of MgCO3 is heated with a 75 yield
50
Drill Calculate the volume of CO2 at STP the
mass of MgO formed when 4.2 kg of MgCO3 is heated
with a 75 yield
51
AP Calculate the mass of liquid product formed
when 6.0 g of sodium hydroxide is added to a 250
mL solution 0.40 M hydrochloric acid
52
Chm II Calculate the mass of water NaCl
formed when 6.0 g of sodium hydroxide is added to
a 250 mL solution 0.40 M hydrochloric acid
53
AP 33.1 g of lead(II)nitrate was added to 1500
mL 0.10 M potassium iodide. Calculate mass of
solid product formed.
54
Chm II 33.1 g of Pb(NO3)2 was added to 1500 mL
0.10 M KI. Calculate mass of PbI2 formed.
55
Chm II 29.7 g of BaBr2 was added to 1500 mL 0.10
M K2SO4. Calculate mass of BaSO4 formed.
56
An 30.0 g unknown sample (containing only C, H,
O) was burned in excess oxygen yielding 66 g CO2
36 g H2O. Calculate its empirical formula
57
An 240 g unknown sample (containing only C, H, S,
O) was burned in excess oxygen yielding 352 g
CO2, 144 g H2O, 128 g, SO2. Calculate its
empirical formula
58
Calculate the mass of solid product formed when
3.31 g of Pb(NO3)2 is added to a 75.0 mL solution
0.20 M KI
59
Drill

• Convert 66.2 mg lead(II)nitrate to atoms

60
Drill

• 20.0 g of solid sodium hydroxide is added to
  800.0 mL of 0.50 M hydrochloric acid. Calculate
  volume of water formed.

61
Name the Following
BaCl2 Mn2O3 SF2 NH3 CaSO4 (NH4)3PO3 Fe(NO3)2
KClO3
62
Derive formulas for
Sodium hydroxide Calcium carbonate Iron(III)phosph
ate Dinitrogen tetroxide
63
Make conversions

• 64 kg SO2 to mL gas
• 11.2 mL NH3 to atoms
• 180 km/hr to cm/s

64
Drill 7.2 g Ca(HCO3)2 was synthesized when 7.0 g
of CaO, 2.24 L of CO2 at STP, 9.0 g H2O are
combined. Calculate yield.
65
AP CHM HW

• Problem 73
• Page 110

66
Predict all for

• Aqueous iron(III)chloride and aqueous
  lead(II)nitrate are combined

67
Predict all for

• Fluorine gas is bubbled through aqueous aluminum
  chloride

68
Predict all for

• Ethane (C2H6) is burned in excess oxygen

69
Predict all for

• Solid barium hydroxide is added to a solution of
  hydroiodic acid