The Store Is About The House Who Left The Man Highschool Killer Whale

2728 words - 11 pages

Page 1
CHAPTER 8 HW PRACTICE - SOLUTIONS
MOLE-MOLE RELATIONSHIPS
1.)   H2S reacts with SO2 through the following balanced reaction.
2 H2S (g) + SO2 (g) → 3 S (s) + 2 H2O (g)
a.   If 2 molecules of SO2 are available, which figure (a-c) shows the correct quantity of H2S that can
react completely with the available SO2? Briefly explain your logic, or show a calculation that
supports your choice.
Available SO2
2 molecules SO2 ×
!
 #$%&'(%&)
 *+,-
 #$%&'(%&
 ,.+ = 4 molecules H2S Thus figure c) is correct.
b.   Upon complete reaction of the 2 molecules SO2 with sufficient H2S,
•   How many solid S atoms are made? 6 S atoms (3 S for every one SO2)
•   How many molecules of H2O are made? 4 molecules H2O (2 for every SO2)
c.   Upon complete reaction of 2.0 moles of SO2 with sufficient H2S, how many moles of H2O are
made? 4.0 moles of H2O
2.)   HCl reacts with O2 through the following balanced reaction. If 12 molecules of HCl are available,
which figure (a-c) shows the correct quantity of O2 that can react completely with the available HCl?
Briefly explain your logic, or show a calculation that supports your choice.
4 HCl (g) + O2 (g) → 2 Cl2 (g) + 2 H2O (g)
Available HCl
12 molecules HCl ×
-
 #$%&'(%&
 .+/
 #$%&'(%&)
 *0% = 3 molecules O2 Thus figure b) is correct.
Page 2
3.)   How many moles of Bi2O3 can be formed from complete reaction of 0.250 moles of Bi through this
balanced equation?
4 Bi (s) + 3 O2 (g) → 2 Bi2O3 (s)
0.250 mol Bi × !
 #$%
 12+.3/
 #$%
 12 = 0.125 mol Bi2O3
4.)   How many moles of H2 completely react with 0.378 moles of SnO2 through this balanced equation?
SnO2 (s) + 2 H2 (g) → Sn (s) + 2 H2O (g)
0.378 mol SnO2 ×
!
 #$%
 *+-
 #$%
 ,4.+ = 0.756 mol H2
5.)   How many moles of HCl can be formed from complete reaction of 35.0 millimoles of water through
this balanced equation?
SiCl4 (l) + 2 H2O (l) → SiO2 (s) + 4 HCl (g)
35.0 mmol H2O ×
-
 #$%
 *+.-555
 ##$% × /
 #$%
 *0%!
 #$%
 *0% = 0.0700 mol HCl
MOLE-MASS RELATIONSHIPS
6.)   How many grams of CO2 can be formed from complete reaction of 0.750 moles of C5H12 through this
balanced equation?
C5H12 (l) + 8 O2 (g) → 5 CO2 (g) + 6 H2O (l)
0.750 mol C5H12 ×
6
 #$%
 0.+-
 #$%
 07*8+ × //.5-
 :
 0.+-
 #$%
 0.+ = 165 g CO2
MMCO2 = 12.01 + 2(16.00) = 44.01 g/mol
7.)   How many grams of each product can be formed from complete reaction of 0.0990 moles of Fe2O3
through this balanced equation?
Fe2O3 (s) + 2 Al (s) → 2 Fe (s) + Al2O3 (s)
0.0990 mol Fe2O3 ×
!
 #$%
 ;&-
 #$%
 ;&+.3 × 66.<6
 :
 ;&-
 #$%
 ;& = 11.1 g Fe
0.0990 mol Fe2O3 ×
-
 #$%
 =%+.3-
 #$%
 ;&+.3 × -5-.>?
 :
 =%+.3-
 #$%
 =%+.3 = 10.1 g Al2O3
MMAl2O3 = 2(26.98) + 3(16.00) = 101.96 g/mol
Page 3
8.)   Perform the following calculations regarding this balanced equation:
3 NaOH (s) + H3PO4 (aq) → Na3PO4 (aq) + 3 H2O (l)
a.   How many moles of water can be formed from complete reaction of 0.7077 grams of NaOH?
0.7077 g NaOH ×
-
 #$%...

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