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Deck 5: Moles, Concentrations, and Dilutions: Making Sense of Chemical Numbers
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How many moles are there in 121.6 g of glycine?
A) 1.6 mol
B) 0.625 mol
C) 121.6 mol
D) 8.76 103 mol
E) 76 mol
A) 1.6 mol
B) 0.625 mol
C) 121.6 mol
D) 8.76 103 mol
E) 76 mol
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Deck 5: Moles, Concentrations, and Dilutions: Making Sense of Chemical Numbers
1
You can have a mole of which of the following? Select any that apply.
A) Atoms
B) Ions
C) Molecules
D) Electrons
E) . Protons
A) Atoms
B) Ions
C) Molecules
D) Electrons
E) . Protons
A,B,C,D,E
2
Which of the following numbers represents the Avogadro constant?
A) 6 1023
B) 1 1023
C) 6 102
D) 23
E) 623
A) 6 1023
B) 1 1023
C) 6 102
D) 23
E) 623
A
3
Which of the following is the correct mass of one mole of 12C?
A) 1 g
B) 12.5 g
C) 6 1023 g
D) 72 g
E) 12 g
A) 1 g
B) 12.5 g
C) 6 1023 g
D) 72 g
E) 12 g
E
4
The molar mass of a compound has which of the following units?
A) mol
B) g mol-1
C) G
D) amu
E) mol g-1
A) mol
B) g mol-1
C) G
D) amu
E) mol g-1
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5
Which of the following has the greatest mass, noting that the molar mass of carbon is 12; the molar mass of oxygen is 16; the molar mass of hydrogen is 1; and the molar mass of nitrogen is 15?
A) 10 mol H2
B) 2 mol CH4
C) 5 mol H2O
D) 3 mol NH3
E) 5 mol O2
A) 10 mol H2
B) 2 mol CH4
C) 5 mol H2O
D) 3 mol NH3
E) 5 mol O2
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6
How many moles are there in 30 g of C?
A) 360 mol
B) 30 mol
C) 2.5 mol
D) 0.4 mol
E) 12 mol
A) 360 mol
B) 30 mol
C) 2.5 mol
D) 0.4 mol
E) 12 mol
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7
What is the mass of 1.5 mol CH3OH?
A) 48 g
B) 21.333 g
C) 32 g
D) 0.05 g
E) 1.5 g
A) 48 g
B) 21.333 g
C) 32 g
D) 0.05 g
E) 1.5 g
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8
2 moles of the amino acid glycine have a mass of 152
A) 152 g mol-1
B) 0.013 g mol-1
C) 2 g mol-1
D) 304 g mol-1
E) 76 g mol-1
A) 152 g mol-1
B) 0.013 g mol-1
C) 2 g mol-1
D) 304 g mol-1
E) 76 g mol-1
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9
How many moles are there in 121.6 g of glycine?
A) 1.6 mol
B) 0.625 mol
C) 121.6 mol
D) 8.76 103 mol
E) 76 mol
A) 1.6 mol
B) 0.625 mol
C) 121.6 mol
D) 8.76 103 mol
E) 76 mol
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10
Which of the following two quantities are identical?
A) 1 dm3
B) 1 m3
C) 1 L
D) 100 mL
E) 1 cm3
A) 1 dm3
B) 1 m3
C) 1 L
D) 100 mL
E) 1 cm3
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11
The concentration of a substance is defined as the number of moles in what volume?
A) 1 mL
B) 1 cm3
C) 1 L
D) 1 m3
E) 1 L
A) 1 mL
B) 1 cm3
C) 1 L
D) 1 m3
E) 1 L
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12
What amount of hydrogen chloride is present in 500 mL of a solution with a concentration of 0.5 mol L-1?
A) 0.5 mol
B) 250 mol
C) 1000 mol
D) 0.001 mol
E) 0.25 mol
A) 0.5 mol
B) 250 mol
C) 1000 mol
D) 0.001 mol
E) 0.25 mol
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13
How many moles are present in 10 mL of a sodium chloride (salt) solution, with a concentration of 2 mol L-1?
A) 0.02 mol
B) 20 mol
C) 0.2 mol
D) 5 mol
E) 0.1 mol
A) 0.02 mol
B) 20 mol
C) 0.2 mol
D) 5 mol
E) 0.1 mol
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14
What is the concentration of 100 mL of a solution containing 2.5 moles of glucose?
A) 40 mol L-1
B) 0.025 mol L-1
C) 25 mol L-1
D) 250 mol L-1
E) 0.25 mol L-1
A) 40 mol L-1
B) 0.025 mol L-1
C) 25 mol L-1
D) 250 mol L-1
E) 0.25 mol L-1
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15
How many moles of NaOH do we need to prepare 250 mL of a 2M solution?
A) 0.5 mol
B) 500 mol
C) 0.008 mol
D) 8 mol
E) 2 mol
A) 0.5 mol
B) 500 mol
C) 0.008 mol
D) 8 mol
E) 2 mol
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16
How many moles of NH3 do we need to prepare 100 mL of a 0.5M solution?
A) 0.5 mol
B) 0.2 mol
C) 200 mol
D) 0.05 mol
E) 50 mol
A) 0.5 mol
B) 0.2 mol
C) 200 mol
D) 0.05 mol
E) 50 mol
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17
We have 100 mL of a solution of NaCl with a concentration of 0.5 mol L-1 and want to dilute it to a concentration of 0.1 mol L-1. How much water would we need to add to achieve this?
A) 0.5 L
B) 0.4 L
C) 500 L
D) 0.005 L
E) 0.1 L
A) 0.5 L
B) 0.4 L
C) 500 L
D) 0.005 L
E) 0.1 L
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18
A sample of a solution with concentration of 0.005 mol L-1 has a molar absorptivity of 150 L mol-1 cm-1 at 350 nm. What absorbance will be measured by a UV-visible spectrophotometer when the sample is measured in a cuvette with a path length of 1 cm at 350 nm?
A) 3.3 10-3
B) 0.75
C) 30 000
D) 75
E) 0.075
A) 3.3 10-3
B) 0.75
C) 30 000
D) 75
E) 0.075
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19
A substance, X, has a molar absorptivity of 1250 L mol-1 cm-1 at 325 nm. A sample of X gives an absorbance of 0.8 when measured in a UV-visible spectrophotometer at 325 nm with a path length of 1 cm. What is the concentration of the sample of X?
A) 1000 mol L-1
B) 1 mol L-1
C) 1563 mol L-1
D) 6.4 10-4 mol L-1
E) 1.56 mol L-1
A) 1000 mol L-1
B) 1 mol L-1
C) 1563 mol L-1
D) 6.4 10-4 mol L-1
E) 1.56 mol L-1
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20
Two compounds, A and B, react with the stoichiometry 1:3, i.e. A + 3B. If there are 0.1 moles of A present in a sample initially, how many moles of B must be added for A to be completely consumed?
A) 0.1 mol
B) 0.3 mol
C) 0.0333 mol
D) 3 mol
E) 1 mol
A) 0.1 mol
B) 0.3 mol
C) 0.0333 mol
D) 3 mol
E) 1 mol
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21
A solution containing red blood cells at a concentration of 2000 cells per mL undergoes three serial dilution steps, whereby 1 mL of starting solution is diluted with 9 mL of solvent at each step. What is the concentration of red blood cells after the final dilution step?
A) 666 cells mL-1
B) 2.47 cells mL-1
C) 2 cells mL-1
D) 20 cells mL-1
E) 74.1 cells mL-1
A) 666 cells mL-1
B) 2.47 cells mL-1
C) 2 cells mL-1
D) 20 cells mL-1
E) 74.1 cells mL-1
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22
25 mL of a growth medium containing bacteria at a concentration of 3 105 cells per litre is diluted to a volume of 0.05 L. What is the concentration of bacteria after dilution?
A) 1.5 106 cells L-1
B) 1.75 108 cells L-1
C) 6.7 10-6 cells L-1
D) 6 105 cells L-1
E) 1.5 105 cells L-1
A) 1.5 106 cells L-1
B) 1.75 108 cells L-1
C) 6.7 10-6 cells L-1
D) 6 105 cells L-1
E) 1.5 105 cells L-1
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