Q. What is the mass of 0.25 moles of glucose (C6H12O6)? (Molar mass = 180 g/mol)
A.
45 g
B.
90 g
C.
60 g
D.
75 g
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Solution
Mass = moles × molar mass = 0.25 moles × 180 g/mol = 45 g.
Correct Answer: B — 90 g
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Q. What is the mass of 0.5 moles of CaCO3?
A.
50 g
B.
25 g
C.
100 g
D.
75 g
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Solution
Molar mass of CaCO3 = 40 + 12 + 16*3 = 100 g/mol. Mass = moles x molar mass = 0.5 moles x 100 g/mol = 50 g.
Correct Answer: B — 25 g
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Q. What is the mass of 0.5 moles of NaCl?
A.
29 g
B.
58 g
C.
14 g
D.
0.5 g
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Solution
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol. Mass = moles x molar mass = 0.5 moles x 58.5 g/mol = 29.25 g.
Correct Answer: A — 29 g
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Q. What is the mass of 0.5 moles of sodium chloride (NaCl)?
A.
29 g
B.
35 g
C.
58 g
D.
70 g
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Solution
The molar mass of NaCl is 58 g/mol. Therefore, 0.5 moles of NaCl = 0.5 x 58 g = 29 g.
Correct Answer: C — 58 g
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Q. What is the mass of 0.75 moles of sulfuric acid (H2SO4)?
A.
75 g
B.
98 g
C.
147 g
D.
50 g
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Solution
Molar mass of H2SO4 = 2*1 + 32 + 4*16 = 98 g/mol. Mass = moles x molar mass = 0.75 moles x 98 g/mol = 73.5 g.
Correct Answer: B — 98 g
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Q. What is the mass of 1 mole of water (H2O)?
A.
18 g
B.
16 g
C.
20 g
D.
22 g
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Solution
The molar mass of water (H2O) is 18 g/mol (2*1 for H + 16 for O).
Correct Answer: A — 18 g
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Q. What is the mass of 2 moles of carbon dioxide (CO2)?
A.
44 g
B.
22 g
C.
88 g
D.
66 g
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Solution
The molar mass of CO2 is 12 g/mol (C) + 16 g/mol x 2 (O) = 44 g/mol. Therefore, 2 moles of CO2 weigh 2 x 44 g = 88 g.
Correct Answer: A — 44 g
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Q. What is the mass of 2 moles of sulfuric acid (H2SO4)?
A.
98 g
B.
196 g
C.
294 g
D.
392 g
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Solution
Molar mass of H2SO4 = 2*1 + 32 + 4*16 = 98 g/mol. Mass = 2 moles x 98 g/mol = 196 g.
Correct Answer: B — 196 g
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Q. What is the mass of 3 moles of carbon dioxide (CO2)?
A.
44 g
B.
66 g
C.
132 g
D.
22 g
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Solution
The molar mass of CO2 is 12 g/mol (C) + 16 g/mol x 2 (O) = 44 g/mol. Therefore, 3 moles of CO2 weigh 3 x 44 g = 132 g.
Correct Answer: A — 44 g
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Q. What is the mass of 3 moles of NaCl?
A.
87 g
B.
58.5 g
C.
174 g
D.
3 g
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Solution
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol. Mass = moles x molar mass = 3 moles x 58.5 g/mol = 174 g.
Correct Answer: C — 174 g
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Q. What is the mass of 3 moles of sulfuric acid (H2SO4)?
A.
98 g
B.
196 g
C.
294 g
D.
392 g
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Solution
Molar mass of H2SO4 = 2*1 + 32 + 4*16 = 98 g/mol. Mass = 3 moles x 98 g/mol = 294 g.
Correct Answer: B — 196 g
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Q. What is the mass of KCl produced when 10 g of K reacts with excess Cl2?
A.
74.5 g
B.
10 g
C.
20 g
D.
30 g
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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. What is the mass of water produced when 2 moles of hydrogen react with 1 mole of oxygen?
A.
18 g
B.
36 g
C.
54 g
D.
9 g
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Solution
2 moles of H2 produce 2 moles of H2O. Mass of H2O = 2 moles * 18 g/mole = 36 g.
Correct Answer: A — 18 g
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Q. What is the molar mass of CaCO3?
A.
100 g/mol
B.
120 g/mol
C.
80 g/mol
D.
60 g/mol
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Solution
Molar mass of CaCO3 = 40 + 12 + 16*3 = 100 g/mol.
Correct Answer: A — 100 g/mol
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Q. What is the molar mass of sulfuric acid (H2SO4)?
A.
98 g/mol
B.
96 g/mol
C.
100 g/mol
D.
92 g/mol
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Solution
Molar mass = 2*1 + 32 + 4*16 = 98 g/mol.
Correct Answer: A — 98 g/mol
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Q. What is the molar mass of the product formed when 1 mole of Mg reacts with 2 moles of HCl?
A.
24.3 g
B.
36.5 g
C.
58.5 g
D.
74.5 g
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Solution
Mg + 2HCl → MgCl2 + H2. Molar mass of MgCl2 = 24.3 + 2*35.5 = 95.3 g.
Correct Answer: D — 74.5 g
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Q. What is the molar mass of the product formed when 1 mole of nitrogen reacts with 3 moles of hydrogen?
A.
28 g
B.
14 g
C.
32 g
D.
18 g
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Solution
N2 + 3H2 → 2NH3. Molar mass of NH3 = 14 + 3 = 17 g.
Correct Answer: A — 28 g
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Q. What is the molar mass of water (H2O)?
A.
16 g/mol
B.
18 g/mol
C.
20 g/mol
D.
22 g/mol
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Solution
The molar mass of water is calculated as follows: H (1 g/mol) x 2 + O (16 g/mol) = 18 g/mol.
Correct Answer: B — 18 g/mol
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Q. What is the molarity of a solution containing 5 moles of solute in 2 liters of solution?
A.
2.5 M
B.
5 M
C.
10 M
D.
0.5 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 number of atoms in 2 moles of aluminum (Al)? (2044)
A.
6.022 x 10^23
B.
1.2044 x 10^24
C.
3.011 x 10^23
D.
12.044 x 10^24
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Solution
Number of atoms = moles x Avogadro's number = 2 moles x 6.022 x 10^23 atoms/mole = 1.2044 x 10^24 atoms.
Correct Answer: B — 1.2044 x 10^24
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Q. What is the number of atoms in 2 moles of CaCO3?
A.
6.022 x 10^23
B.
1.2044 x 10^24
C.
3.011 x 10^23
D.
1.8066 x 10^24
Show solution
Solution
Each CaCO3 has 5 atoms (1 Ca, 1 C, 3 O). Number of atoms = moles x atoms per molecule x Avogadro's number = 2 moles x 5 x 6.022 x 10^23 = 1.206 x 10^24 atoms.
Correct Answer: D — 1.8066 x 10^24
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Q. What is the number of atoms in 2 moles of Na2SO4?
A.
6.022 x 10^23
B.
1.2044 x 10^24
C.
1.2044 x 10^25
D.
3.011 x 10^23
Show solution
Solution
Na2SO4 has 2 Na + 1 S + 4 O = 7 atoms. Number of atoms = moles x atoms per mole = 2 moles x 7 atoms = 14 atoms = 1.2044 x 10^24 atoms.
Correct Answer: B — 1.2044 x 10^24
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Q. What is the number of atoms in 2 moles of NaCl? (2044)
A.
6.022 x 10^23
B.
1.2044 x 10^24
C.
1.2044 x 10^25
D.
3.011 x 10^23
Show solution
Solution
Each NaCl unit has 2 atoms (Na and Cl). Therefore, 2 moles of NaCl contain 2 x 6.022 x 10^23 x 2 = 1.2044 x 10^24 atoms.
Correct Answer: B — 1.2044 x 10^24
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Q. What is the number of moles in 10 grams of Na?
A.
0.43
B.
0.22
C.
0.5
D.
0.1
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Solution
Molar mass of Na = 23 g/mol. Number of moles = mass / molar mass = 10 g / 23 g/mol = 0.43 moles.
Correct Answer: A — 0.43
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Q. What is the number of moles in 10 grams of NaOH?
A.
0.25
B.
0.5
C.
0.75
D.
1
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Solution
Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol. Number of moles = mass/molar mass = 10 g / 40 g/mol = 0.25 moles.
Correct Answer: B — 0.5
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Q. What is the number of moles in 100 grams of NaOH?
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Solution
Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol. Number of moles = mass/molar mass = 100 g / 40 g/mol = 2.5 moles.
Correct Answer: A — 1
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Q. What is the number of moles in 180 grams of glucose (C6H12O6)?
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Solution
Molar mass of C6H12O6 = 6*12 + 12*1 + 6*16 = 180 g/mol. Number of moles = mass/molar mass = 180 g / 180 g/mol = 1 mole.
Correct Answer: A — 1
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Q. What is the number of moles in 44 grams of CO2?
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Solution
Molar mass of CO2 = 12 + 16*2 = 44 g/mol. Number of moles = mass/molar mass = 44 g / 44 g/mol = 1 mole.
Correct Answer: A — 1
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Q. What is the number of moles in 5 liters of a 2 M NaCl solution?
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Solution
Moles = Molarity x Volume = 2 moles/L x 5 L = 10 moles.
Correct Answer: A — 2.5
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Q. What is the percentage composition of carbon in glucose (C6H12O6)?
A.
40%
B.
50%
C.
60%
D.
30%
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Solution
Molar mass of glucose = 6(12) + 12(1) + 6(16) = 180 g. Percentage of carbon = (72/180) x 100 = 40%.
Correct Answer: A — 40%
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