Q. What is the mass of solute in grams in a 3 M solution of NaCl in 1 L of solution? (2023)
A.
58.44 g
B.
174.32 g
C.
29.22 g
D.
87.16 g
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Solution
Molar mass of NaCl = 58.44 g/mol; mass = moles × molar mass = 3 moles × 58.44 g/mol = 175.32 g
Correct Answer:
B
— 174.32 g
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Q. What is the mass of solute in grams required to make 1 L of a 0.1 M solution of NaCl? (Molar mass of NaCl = 58.5 g/mol) (2021)
A.
5.85 g
B.
10 g
C.
1 g
D.
2 g
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Solution
Mass = moles × molar mass = (0.1 moles/L × 1 L) × 58.5 g/mol = 5.85 g.
Correct Answer:
A
— 5.85 g
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Q. What is the mass of solute in grams required to make 1 L of a 0.5 M NaOH solution? (2021)
A.
20 g
B.
40 g
C.
10 g
D.
30 g
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Solution
Molar mass of NaOH = 40 g/mol. Mass = moles × molar mass = 0.5 moles × 40 g/mol = 20 g.
Correct Answer:
B
— 40 g
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Q. What is the mass percent of a solution containing 10 g of solute in 90 g of solvent?
A.
10%
B.
90%
C.
50%
D.
20%
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Solution
Mass percent = (mass of solute / total mass of solution) x 100 = (10 g / (10 g + 90 g)) x 100 = 10%
Correct Answer:
A
— 10%
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Q. What is the molality of a solution made by dissolving 10 moles of solute in 5 kg of solvent? (2022)
A.
2 m
B.
1 m
C.
0.5 m
D.
3 m
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Solution
Molality (m) = moles of solute / kg of solvent = 10 moles / 5 kg = 2 m.
Correct Answer:
A
— 2 m
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Q. What is the molarity of a solution containing 5 moles of solute in 2 liters of solution? (2021) 2021
A.
2.5 M
B.
5 M
C.
10 M
D.
1 M
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Solution
Molarity (M) = moles of solute / liters of solution = 5 moles / 2 L = 2.5 M.
Correct Answer:
A
— 2.5 M
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Q. What is the molarity of a solution prepared by dissolving 5 grams of NaCl in enough water to make 250 mL of solution? (Molar mass of NaCl = 58.5 g/mol) (2023)
A.
0.34 M
B.
0.42 M
C.
0.25 M
D.
0.50 M
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Solution
Molarity (M) = moles of solute / liters of solution. Moles of NaCl = 5 g / 58.5 g/mol = 0.0855 moles. Volume of solution = 250 mL = 0.250 L. M = 0.0855 moles / 0.250 L = 0.342 M, approximately 0.34 M.
Correct Answer:
A
— 0.34 M
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Q. What is the normality of a solution containing 3 moles of H2SO4 in 1 liter of solution? (2022) 2022
A.
3 N
B.
6 N
C.
1.5 N
D.
0.5 N
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Solution
Normality (N) = n * molarity, where n = number of equivalents. For H2SO4, n = 2. Thus, N = 2 * 3 M = 6 N.
Correct Answer:
B
— 6 N
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Q. What is the percentage by mass of a solution containing 15 grams of solute in 85 grams of solvent? (2021)
A.
15%
B.
17.65%
C.
20%
D.
25%
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Solution
Percentage by mass = (mass of solute / total mass) × 100 = (15 g / (15 g + 85 g)) × 100 = 17.65%.
Correct Answer:
B
— 17.65%
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Q. What is the percentage concentration of a solution containing 15 g of solute in 150 g of solution? (2023)
A.
10%
B.
15%
C.
20%
D.
25%
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Solution
Percentage concentration = (mass of solute / mass of solution) × 100 = (15 g / 150 g) × 100 = 10%
Correct Answer:
B
— 15%
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Q. What is the percentage concentration of a solution containing 20 g of solute in 200 g of solution? (2021)
A.
10%
B.
20%
C.
5%
D.
15%
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Solution
Percentage concentration = (mass of solute / mass of solution) × 100 = (20 g / 200 g) × 100 = 10%.
Correct Answer:
A
— 10%
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Q. What is the term for a solution that contains the maximum amount of solute that can dissolve at a given temperature? (2022)
A.
Unsaturated solution
B.
Saturated solution
C.
Supersaturated solution
D.
Concentrated solution
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Solution
A saturated solution is one that contains the maximum amount of solute that can dissolve at a specific temperature.
Correct Answer:
B
— Saturated solution
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Q. What is the volume of 1 M HCl solution needed to obtain 0.5 moles of HCl? (2022)
A.
0.5 L
B.
1 L
C.
2 L
D.
0.25 L
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Solution
Volume = moles / molarity = 0.5 moles / 1 M = 0.5 L.
Correct Answer:
A
— 0.5 L
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Q. What is the volume of a 2 M NaOH solution needed to obtain 4 moles of NaOH? (2021) 2021
A.
2 L
B.
1 L
C.
0.5 L
D.
4 L
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Solution
Volume (L) = moles / molarity = 4 moles / 2 M = 2 L.
Correct Answer:
A
— 2 L
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Q. Which of the following is an example of a colligative property? (2021)
A.
Boiling point elevation
B.
Density
C.
Color
D.
pH
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Solution
Colligative properties depend on the number of solute particles in a solution, and boiling point elevation is one such property.
Correct Answer:
A
— Boiling point elevation
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Q. Which of the following solutions has the highest freezing point? (2020)
A.
0.1 M NaCl
B.
0.1 M KCl
C.
0.1 M glucose
D.
0.1 M CaCl2
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Solution
0.1 M glucose is a non-electrolyte and does not dissociate, thus it has the highest freezing point compared to the ionic solutions.
Correct Answer:
C
— 0.1 M glucose
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