Q. How many grams are in 0.25 moles of glucose (C6H12O6)?
-
A.
30 g
-
B.
45 g
-
C.
75 g
-
D.
90 g
Solution
Molar mass of C6H12O6 = 6*12 + 12*1 + 6*16 = 180 g/mol. Mass = 0.25 moles x 180 g/mol = 45 g.
Correct Answer:
D
— 90 g
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Q. How many grams are in 0.25 moles of KCl?
-
A.
35 g
-
B.
70 g
-
C.
17.5 g
-
D.
140 g
Solution
Molar mass of KCl = 39 + 35.5 = 74.5 g/mol. Mass = moles x molar mass = 0.25 moles x 74.5 g/mol = 18.625 g.
Correct Answer:
B
— 70 g
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Q. How many grams are in 0.25 moles of sulfuric acid (H2SO4)?
-
A.
49 g
-
B.
98 g
-
C.
24.5 g
-
D.
12.25 g
Solution
Molar mass of H2SO4 = 98 g/mol. Mass = moles x molar mass = 0.25 moles x 98 g/mol = 24.5 g.
Correct Answer:
A
— 49 g
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Q. How many grams are in 0.5 moles of glucose (C6H12O6)? (2023)
-
A.
90 g
-
B.
180 g
-
C.
45 g
-
D.
60 g
Solution
Molar mass of C6H12O6 = 6*12 + 12*1 + 6*16 = 180 g/mol. Mass = 0.5 moles x 180 g/mol = 90 g.
Correct Answer:
A
— 90 g
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Q. How many grams are in 0.5 moles of sodium (Na)?
-
A.
11 g
-
B.
22 g
-
C.
5.5 g
-
D.
44 g
Solution
The molar mass of sodium is approximately 23 g/mol. Therefore, 0.5 moles of Na weigh 0.5 x 23 g = 11 g.
Correct Answer:
A
— 11 g
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Q. How many grams are in 2 moles of carbon dioxide (CO2)?
-
A.
44 g
-
B.
88 g
-
C.
22 g
-
D.
66 g
Solution
The molar mass of CO2 is 44 g/mol. Thus, 2 moles of CO2 = 2 x 44 g = 88 g.
Correct Answer:
B
— 88 g
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Q. How many grams are in 3 moles of glucose (C6H12O6)?
-
A.
180 g
-
B.
360 g
-
C.
540 g
-
D.
90 g
Solution
Molar mass of glucose = 6*12 + 12*1 + 6*16 = 180 g/mol. Mass = moles x molar mass = 3 moles x 180 g/mol = 540 g.
Correct Answer:
B
— 360 g
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Q. How many grams are in 4 moles of potassium chloride (KCl)? (2022)
-
A.
74 g
-
B.
148 g
-
C.
296 g
-
D.
37 g
Solution
Molar mass of KCl = 39 + 35.5 = 74.5 g/mol. Mass = 4 moles x 74.5 g/mol = 298 g.
Correct Answer:
C
— 296 g
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Q. How many grams are in 4 moles of sulfuric acid (H2SO4)? (2023)
-
A.
196 g
-
B.
98 g
-
C.
392 g
-
D.
294 g
Solution
Molar mass of H2SO4 = 2*1 + 32 + 4*16 = 98 g/mol. Mass = 4 moles x 98 g/mol = 392 g.
Correct Answer:
C
— 392 g
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Q. How many grams of CO2 are produced from the complete combustion of 1 mole of C3H8?
-
A.
44 g
-
B.
88 g
-
C.
132 g
-
D.
22 g
Solution
C3H8 + 5O2 → 3CO2 + 4H2O. 1 mole of C3H8 produces 3 moles of CO2. Mass = 3 * 44 g = 132 g.
Correct Answer:
B
— 88 g
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Q. How many grams of KCl are needed to prepare 0.5 M solution in 500 mL of water? (2023)
-
A.
14.9 g
-
B.
7.45 g
-
C.
29.8 g
-
D.
3.73 g
Solution
Molarity = moles/volume(L). Moles = 0.5 mol/L * 0.5 L = 0.25 mol. Mass = moles * molar mass = 0.25 mol * 74.5 g/mol = 18.625 g.
Correct Answer:
B
— 7.45 g
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Q. How many grams of KCl are needed to prepare 0.5 moles of KCl solution?
-
A.
37.5 g
-
B.
74.5 g
-
C.
50 g
-
D.
100 g
Solution
The molar mass of KCl is 39 g/mol (K) + 35.5 g/mol (Cl) = 74.5 g/mol. Therefore, 0.5 moles of KCl will weigh 0.5 x 74.5 g = 37.25 g.
Correct Answer:
B
— 74.5 g
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Q. How many grams of KCl are needed to prepare 0.5 moles of KCl solution? (Molar mass of KCl = 74.5 g/mol)
-
A.
37.25 g
-
B.
74.5 g
-
C.
148.5 g
-
D.
18.5 g
Solution
To find the mass, use the formula: mass = moles x molar mass. Thus, 0.5 moles x 74.5 g/mol = 37.25 g.
Correct Answer:
A
— 37.25 g
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Q. How many grams of KCl are needed to prepare 0.5 moles of KCl?
-
A.
37.5 g
-
B.
45 g
-
C.
50 g
-
D.
60 g
Solution
The molar mass of KCl is approximately 74.5 g/mol. Therefore, 0.5 moles of KCl will weigh 0.5 x 74.5 g = 37.25 g.
Correct Answer:
B
— 45 g
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Q. How many grams of KCl are needed to prepare 250 mL of a 0.5 M solution? (2023) 2023
-
A.
7.45 g
-
B.
12.5 g
-
C.
9.25 g
-
D.
5.25 g
Solution
Molar mass of KCl = 74.55 g/mol. Grams = Molarity * Volume (L) * Molar mass = 0.5 M * 0.25 L * 74.55 g/mol = 9.31 g.
Correct Answer:
A
— 7.45 g
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Q. How many grams of KCl are needed to prepare 250 mL of a 2 M solution? (2023)
-
A.
37.25 g
-
B.
50 g
-
C.
75 g
-
D.
25 g
Solution
Molar mass of KCl = 74.55 g/mol. Grams = moles × molar mass = 0.5 moles × 74.55 g/mol = 37.25 g.
Correct Answer:
A
— 37.25 g
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Q. How many grams of KCl are needed to prepare 250 mL of a 2 M solution? (Molar mass of KCl = 74.5 g/mol) (2023)
-
A.
37.25 g
-
B.
74.5 g
-
C.
18.625 g
-
D.
9.25 g
Solution
Grams = moles × molar mass = (2 moles/L × 0.25 L) × 74.5 g/mol = 37.25 g.
Correct Answer:
A
— 37.25 g
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Q. How many grams of KCl can be produced from the reaction of 10 g of K with excess Cl2?
-
A.
74.5 g
-
B.
37.25 g
-
C.
148.5 g
-
D.
18.5 g
Solution
10 g of K = 0.25 moles. K + Cl2 → KCl, so 0.25 moles of KCl = 0.25 * 74.5 g = 18.625 g.
Correct Answer:
A
— 74.5 g
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Q. How many grams of NaOH are needed to neutralize 1 mole of HCl?
-
A.
40 g
-
B.
36.5 g
-
C.
58.5 g
-
D.
23 g
Solution
The reaction between NaOH and HCl is 1:1. The molar mass of NaOH is 40 g/mol, so 1 mole of NaOH is needed, which weighs 40 g.
Correct Answer:
C
— 58.5 g
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Q. How many grams of NaOH are needed to prepare 0.5 moles of NaOH solution?
-
A.
20 g
-
B.
40 g
-
C.
10 g
-
D.
30 g
Solution
The molar mass of NaOH is 40 g/mol. Therefore, to prepare 0.5 moles, you need 0.5 x 40 g = 20 g.
Correct Answer:
B
— 40 g
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Q. How many grams of NaOH are needed to prepare 0.5 moles of NaOH solution? (Molar mass of NaOH = 40 g/mol)
-
A.
20 g
-
B.
40 g
-
C.
10 g
-
D.
30 g
Solution
To find the mass, use the formula: mass = moles × molar mass. Thus, 0.5 moles × 40 g/mol = 20 g.
Correct Answer:
A
— 20 g
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Q. How many grams of protein are in a food item that provides 160 calories from protein? (Protein = 4 cal/g) (2022)
Solution
Grams of protein = 160 calories / 4 cal/g = 40 grams.
Correct Answer:
B
— 40
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Q. How many grams of protein are recommended daily for an average adult?
-
A.
30 grams
-
B.
50 grams
-
C.
70 grams
-
D.
100 grams
Solution
The Recommended Dietary Allowance (RDA) for protein is about 50 grams for an average adult.
Correct Answer:
B
— 50 grams
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Q. How many grams of solute are needed to prepare 0.5 L of a 1 M NaCl solution? (Molar mass of NaCl = 58.5 g/mol)
-
A.
29.25 g
-
B.
58.5 g
-
C.
14.625 g
-
D.
0.5 g
Solution
Mass of solute = moles × molar mass = 1 mol × 58.5 g/mol = 58.5 g. For 0.5 L, it is 0.5 mol × 58.5 g/mol = 29.25 g.
Correct Answer:
A
— 29.25 g
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Q. How many grams of solute are needed to prepare 2 L of a 1 M solution? (Molar mass = 58.5 g/mol)
-
A.
58.5 g
-
B.
117 g
-
C.
29.25 g
-
D.
145 g
Solution
Grams of solute = moles x molar mass = 2 moles x 58.5 g/mol = 117 g.
Correct Answer:
B
— 117 g
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Q. How many isomers does C4H10 have?
Solution
C4H10 has 2 structural isomers: n-butane and isobutane.
Correct Answer:
B
— 2
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Q. How many isomers does C5H12 have?
Solution
C5H12 has 3 structural isomers: pentane, isopentane, and neopentane.
Correct Answer:
C
— 4
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Q. How many liters of a 0.5 M NaOH solution are needed to obtain 1 mole of NaOH? (2023)
-
A.
1 L
-
B.
2 L
-
C.
0.5 L
-
D.
0.25 L
Solution
Volume = moles / molarity = 1 mole / 0.5 M = 2 L.
Correct Answer:
A
— 1 L
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Q. How many liters of a 0.5 M solution contain 2 moles of solute? (2023)
-
A.
2 L
-
B.
4 L
-
C.
1 L
-
D.
0.5 L
Solution
Volume = moles / molarity = 2 moles / 0.5 M = 4 L
Correct Answer:
B
— 4 L
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Q. How many liters of a 3 M solution can be made from 6 moles of solute? (2023)
-
A.
1 L
-
B.
2 L
-
C.
3 L
-
D.
4 L
Solution
Volume = moles / molarity = 6 moles / 3 M = 2 L.
Correct Answer:
B
— 2 L
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