CHM 130- Exam Chap 7, 8, 9 Comprehensive Questions (Frequently Tested) and Complete Solutions Graded A+

CHM 130- Exam Chap 7, 8, 9
Comprehensive Questions
(Frequently Tested) and Complete
Solutions Graded A+
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THE FIRST 35 QUESTIONS ARE THE MAIN PART:

Multiple Choice

1. Based on the following chemical equation

2C6H6 + 15O2 ¾¾®D 12CO2 + 6H2O

Calculate the number of moles of CO2 that will be produced when 8.90 moles of H2O are
produced as well?
A. 1.07 ´ 1025 moles
B. 4.45 moles
C. 17.8 moles
D. 2.68 ´ 1024 moles



2. How many moles of molecular oxygen will be needed for the complete combustion of
100.0 g of sulfur dioxide? The product of this reaction is sulfur trioxide.
A. 0.7804 moles
B. 1.561 moles
C. 0.641 moles
D. 1.281 moles




3. How many molecules of O2 will be required to produce 1.60 moles of water?

2H2 + O2 ¾¾® 2H2O

, A. 4.82 ´ 1023 B.
9.64 ´ 1023
C. 1.93 ´ 1024
D. 0.800



4. What is the mass of 0.118 moles of AgNO3?
A. 0.118 g
B. 0.710g
C. 7.10 ´ 1023 g.
D. 20.0g




5. Calculate the number of moles of excess reactant that will be left-over when 50.0 g of KI
react with 50.0 g of Br2:

2KI + Br2 ¾¾® 2KBr + I2

A. both reactants are consumed completely
B. 0.145 moles
C. 0.0117 moles
D. 0.162 moles




6. The following reaction: LiOH + HCl ® LiCl + H2O, is an example of
A. combination.
B. decomposition.
C. single-displacement.
D. double-displacement.




7. The reaction: 2C + H2 + 227.4 kJ ® C2H2, is A. endothermic.
B. exothermic.
C. isothermic.
D. protothermic.