R = 0.082 L-atm/K mol 22.4 L @ STP = 1 mole Avagadro's number 6.02 x 1023
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Chemistry 101 Final Exam B 12/11/98 Dr. B. Jackson
101 - 103 Use the following balanced equation
3 Fe + 4 H2O -------> Fe3O4 + 4 H2
101. How many moles of Fe3O4 would you get if you had 4 moles of Fe?
a) 0.75 b) 1.3 c) 3 d) 4 e) none of these
102. How many grams of H2O would be needed to react with 55.8 grams Fe?
a) 18 b) 24 c) 36 d) 72
103. How many grams of Fe3O4 would you get from 1 mole Fe?
a) 69.5 b) 84 c) 77 d) 231.8
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104. In STP, the standard temperature is
a) 0oF b) 0 K c) 0oC d) 25oC
105. What is the volume of 3 moles of methane gas (CH4) at STP?
a) 3 L b) 67.2 L c) 48 L d) 7.5 L
106. What is the mass in grams of 11.2 L of H2 at STP?
a) 1 b) 0.5 c) 2 d) 22.4
107. What is the volume in liters of 16 grams of O2 at STP?
a) 22.4 b) 11.2 c) 0.5
108. The volume of a gas is ________ proportional to the temperature in Kelvin.
a) directly b) inversely
109. How many molecules are present in 5.6 liters of N2 gas at STP?
a) 0.25 b) 1.5 x 1023 c) 3.36 x 1023 d) 3.02 x1023
110. A gas had a mass of 13 grams at 2 atmospheres pressure and a volume of 5 liters t 27oC.
What is the gas?
a) N2 b) O2 c) CO2 d) Br2
111. To what temperature must a gas at 100oC be heated for the volume to double?
a) 50oC b) 200oC c) 746oC d) 473oC
112. A 1 liter steel container contained a gas that was at 27oC and 1 atm pressure. The
temperature was increased to 127oC. What was the new pressure?
a) 1.33 atm b) 1.50 atm c) 0.75 atm d) 4.70 atm
113. If a reaction has an equillibrium constant of 0.15, the reaction favors
a) the reactants b) the product
114. What is the equilibrium constant for the following reaction?
2 H2S <-------> 2 H2 + S2
[H2S] = 1.0 mole/L [H2] = 0.20 mole/L [S2] = 0.80 mole/L
a) 3.2 x 10-2 mole/L b) 0.16 mole/L c) 0.4 mole/L d) none of these
115. The equilibrium constant will change if heat is added to a reaction,
a) true b) false
116. What is the percent concentration (m/v) of a solution that had 15 grams in a total volume of
30 mL of solution?
a) 15% b) 30% c) 50% d) 33%
117. What is the Molarity of a solution which had 4 moles of NaOH (MW 40) in 500 mL of
solution?
a) 2 M b) 4 M c) 8M d) 10 M e) 0.5 M
118. How many milligrams are present in 50 mL of a 5 mg% solution of NaCl?
a) 5 b) 10 c) 2.5 d) 25 e) not enough information given
119. What volume of a 0.5 M solution of HCl (MW 36.5) would contain 3.65 grams of HCl?
a) 100 mL b) 200 mL c) 1 L d) 500 mL
120. An increase in temperature will generally _______ the rate of solubility of a solid solute in a
solvent.
a) increase b) decrease
121. What is the Molarity of a solution that has 10 grams of NaOH (MW40) in 250 mL of
solution?
a) 1.0 M b) 0.1 M c) 0.25 M d) 0.5 M
122. How many milliequivalents of base would be needed to neutralize 200 mL of a 0.3 N HCl?
a) 60 b) 200 c) 67
123. 0.33 N H3PO4 = _____ M H3PO4
a) 0.33 b) 0.66 c) 0.99 d) 0.11
124. How many milliliters of a 0.15 N NaOH solution would be needed to neutralize 30 mL of
a 0.10 N HCl solution?
a) 10 b) 20 c) 25 d) 30 e) 45
125. To what volume must 10 mL of a 12 N H2SO4 be diluted to produce a 2 N H2SO4 solution?
a) 30 mL b) 24 mL c) 60 mL d) 120 mL
126. The greater the surface area of a solute, the faster the rate of dissolution.
a) true b) false
127. A solution has a pOH of 11. This solution is
a) acidic b) basic c) neutral
128. A solution has a pOH of 5. What is the pH?
a) 5 b) 7 c) 9
129. What is the H+ concentration of a solution with a pH of 4.0?
a) 4 M b) 0.0004 M c) 0.0001 M
130. What is the pH of a 4.2 x 10-2 M HCl solution?
a) 1.38 b) 12.62 c) 0.002 d) 1.6 x 10-4
131. What is the pH of a solution of 4.5 x 10-3 M KOH?
a) 2.3 b) 11.7 c) 4.5 d) 3
132. What is the H+ concentration of a NaOH solution with a pOH of 11.5?
a) 2.5 M b) 3 x 10-12 M c) 0.0032 M d) need more information
133. Doing pH problems is as easy as falling off a log.
a) true a) true a) true
Ans: 101b; 102b; 103c; 104c; 105b; 106a; 107b; 108a; 109b; 110b; 111d; 112a; 113a; 114a;
115a; 116c; 117c; 118c; 119b; 120a; 121a; 122a; 123d; 124b; 125c; 126a; 127a; 128c; 129c;
130a; 131b; 132c; 133a