CHEM 135 CH 1-CH 17
1. How many moles of carbon atoms are there in 0.500 mole of C2H6?
A. 0.500 mole
B. 1.00 mole
C. 3.00 moles
D. 4.00 moles: B.1.00 moles
2. How many moles of K2SO4 are in 15.0 g of K2SO4?
A. 0.172 moles
B. 0.111 moles
C. 0.0861 moles
D. 0.119 moles: c. 0.0861 moles
3. How many moles of magnesium are needed to react with 16 g of O2?
2 MgO (s) + O2 (g) ’2 MgO (s)
A. 0.50 mole
B. 1.0 moles
C. 2.0 moles
D. 3.0 moles: B. 1.0 Moles
4. How many moles of water, H2O, are present in 75.0 g H2O?
A. 4.41 moles
B. 4.17 moles
C. 75.0 moles
D. 7.50 moles: B. 4.17 Moles
,5. What is the molar mass of Mg3(PO4)2, a substance formerly used in medi-cine as an
antacid?
A. 71.3 g
B. 118.3 g
C. 262.9 g
D. 214.3 g: C. 262.9 g
6. A diver exhales a bubble with a volume of 250 mL at a pressure of 2.4 atm and a
temperature of 15 °C. What is the volume of the bubble when it reachesthe surface where the
pressure is 1.0 atm and the temperature is 27 °C?
A. 580 mL
B. 630 mL
C. 100 mL
D. 110 mL: B. 630 mL
7. A gas sample containing 12.0 g of He has a volume of 14.0 L. What will thevolume be if
12.0 g of He is added? (Temperature and pressure do not change.)
A. 28.0 L
B. 52.5 L
C. 56.0 L
D. 70.0 L: A. 28.0 L
8. How many grams of glucose are needed to prepare 400. mL of a 2.0%(m/v)glucose
solution?
A. 800. g
B. 0.0050 g
C. 8.0 g
D. 2.0 g: C. 8.0 g
, 9. How many milliliters of a 25% (m/v) NaOH solution would contain 75 g ofNaOH?
A. 25 mL
B. 3.0 x 102 mL
C. 75 mL
D. 33 mL: B. 3.0 x 102 mL
10. How many moles of are in 250 mL of a 3.0 M of CaCl2 solution?
A. 750 moles
B. 1.3 moles
C. 83 moles
D. 0.75 mole: D. 0.75 mole
11. What is the concentration, in m/m%, of a solution prepared from 50.0 gNaCl and 150.0 g
of water?
A. 0.250%
B. 33.3%
C. 40.0%
D. 25.0%: D. 25.0%
12. What is the concentration, in m/v%, of a solution prepared by dissolving
50. g NaCl in a total volume of 2.5 L of solution?
A. 5.0%
B. 2.0%
C. 0.020%
D. 0.050%: B. 2.0%
13. What is the molarity of a KCl solution made by diluting 75.0 mL of a 0.200M solution to
a final volume of 100. mL?
A. 0.267 M
B. 0.150 M
1. How many moles of carbon atoms are there in 0.500 mole of C2H6?
A. 0.500 mole
B. 1.00 mole
C. 3.00 moles
D. 4.00 moles: B.1.00 moles
2. How many moles of K2SO4 are in 15.0 g of K2SO4?
A. 0.172 moles
B. 0.111 moles
C. 0.0861 moles
D. 0.119 moles: c. 0.0861 moles
3. How many moles of magnesium are needed to react with 16 g of O2?
2 MgO (s) + O2 (g) ’2 MgO (s)
A. 0.50 mole
B. 1.0 moles
C. 2.0 moles
D. 3.0 moles: B. 1.0 Moles
4. How many moles of water, H2O, are present in 75.0 g H2O?
A. 4.41 moles
B. 4.17 moles
C. 75.0 moles
D. 7.50 moles: B. 4.17 Moles
,5. What is the molar mass of Mg3(PO4)2, a substance formerly used in medi-cine as an
antacid?
A. 71.3 g
B. 118.3 g
C. 262.9 g
D. 214.3 g: C. 262.9 g
6. A diver exhales a bubble with a volume of 250 mL at a pressure of 2.4 atm and a
temperature of 15 °C. What is the volume of the bubble when it reachesthe surface where the
pressure is 1.0 atm and the temperature is 27 °C?
A. 580 mL
B. 630 mL
C. 100 mL
D. 110 mL: B. 630 mL
7. A gas sample containing 12.0 g of He has a volume of 14.0 L. What will thevolume be if
12.0 g of He is added? (Temperature and pressure do not change.)
A. 28.0 L
B. 52.5 L
C. 56.0 L
D. 70.0 L: A. 28.0 L
8. How many grams of glucose are needed to prepare 400. mL of a 2.0%(m/v)glucose
solution?
A. 800. g
B. 0.0050 g
C. 8.0 g
D. 2.0 g: C. 8.0 g
, 9. How many milliliters of a 25% (m/v) NaOH solution would contain 75 g ofNaOH?
A. 25 mL
B. 3.0 x 102 mL
C. 75 mL
D. 33 mL: B. 3.0 x 102 mL
10. How many moles of are in 250 mL of a 3.0 M of CaCl2 solution?
A. 750 moles
B. 1.3 moles
C. 83 moles
D. 0.75 mole: D. 0.75 mole
11. What is the concentration, in m/m%, of a solution prepared from 50.0 gNaCl and 150.0 g
of water?
A. 0.250%
B. 33.3%
C. 40.0%
D. 25.0%: D. 25.0%
12. What is the concentration, in m/v%, of a solution prepared by dissolving
50. g NaCl in a total volume of 2.5 L of solution?
A. 5.0%
B. 2.0%
C. 0.020%
D. 0.050%: B. 2.0%
13. What is the molarity of a KCl solution made by diluting 75.0 mL of a 0.200M solution to
a final volume of 100. mL?
A. 0.267 M
B. 0.150 M
