Deck 8: The Mole Concept

Question 1

What principle states that equal volumes of gases,at the same temperature and pressure,contain equal numbers of molecules?

A)Avogadro's theory
B)Boyle's theory
C)Charles' theory
D)Dalton's theory
E)none of the above

Answer 1

Avogadro's theory

Question 2

What is the number of magnesium atoms that equal a mass of 24.31 g?

A)1
B)12
C)24
D)6.02 x 1023
E)none of the above

Answer 2

6.02 x 1023

Question 3

What is the term for the volume occupied by 1 mol of any gas at STP?

A)Avogadro's volume
B)molar volume
C)standard volume
D)STP volume
E)none of the above

Answer 3

molar volume

Question 4

How many atoms of nickel equal a mass of 58.69 g? (Refer to the Periodic Table. )

A)1
B)28
C)58.69
D)59
E)6.02 x 1023

Question 5

What is the term that expresses the ratio of mass per unit volume for a gas?

A)gas density
B)gas ratio
C)molar mass
D)molar volume
E)none of the above

Question 6

What is the number of sulfur atoms that equal a mass of 32.07 g?

A)1
B)16
C)32
D)6.02 x 1023
E)none of the above

Question 7

What is the term for a temperature of 0 °C and a pressure of 1 atm?

A)atmospheric temperature and pressure
B)experimental temperature and pressure
C)ideal gas temperature and pressure
D)standard temperature and pressure
E)none of the above

Question 8

How many atoms of cobalt equal a mass of 58.93 g? (Refer to the Periodic Table. )

A)1
B)27
C)58.93
D)59
E)6.02 x 1023

Question 9

What general term refers to the mass of 1 mol of any substance?

A)gram-atomic mass
B)gram-molecular mass
C)gram-formula mass
D)molar mass
E)none of the above

Question 10

What is the term for a list of the mass percent of each element in a compound?

A)compound composition
B)elemental composition
C)mass composition
D)percent composition
E)none of the above

Question 11

What is the term for a chemical formula that expresses the simplest whole number ratio of atoms of each element in a molecule?

A)atomic formula
B)elemental formula
C)empirical formula
D)molecular formula
E)none of the above

Question 12

What is the term for the value corresponding to the number of atoms in 12.01g of carbon?

A)Avogadro's number
B)atomic number
C)mass number
D)mole number
E)none of the above

Question 13

How many atoms of copper equal a mass of 63.55 g? (Refer to the Periodic Table. )

A)1
B)29
C)63.55
D)64
E)6.02 x 1023

Question 14

What is the number of manganese atoms that equal a mass of 54.94 g?

A)1
B)25
C)55
D)6.02 x 1023
E)none of the above

Question 15

What is the term for the chemical formula of a compound that expresses the actual number of atoms of each element in a molecule?

A)atomic formula
B)elemental formula
C)empirical formula
D)molecular formula
E)none of the above

Question 16

Given that Na-23 is the only natural isotope of sodium,what is the mass of one Na atom and the mass of Avogadro's number of Na atoms,respectively?

A)22.99 amu and 22.99 g
B)22.99 g and 22.99 amu
C)23 amu and 23 g
D)23 g and 23 amu
E)none of the above

Question 17

What is the number of magnesium atoms that equal a mass of 24.31 amu?

A)1
B)12
C)24
D)6.02 x 1023
E)none of the above

Question 18

What is the number of sulfur atoms that equal a mass of 32.07 amu?

A)1
B)16
C)32
D)6.02 x 1023
E)none of the above

Question 19

What is the term for the amount of substance that contains 6.02 x 1023 particles?

A)Avogadro's number
B)formula mass
C)molar mass
D)mole
E)none of the above

Question 20

What is the number of manganese atoms that equal a mass of 54.94 amu?

A)1
B)25
C)55
D)6.02 x 1023
E)none of the above

Question 21

What is the molar mass of nitroglycerin,C₃H5O₃(NO₂)3?

A)225.09 g/mol
B)280.16 g/mol
C)227.11 g/mol
D)275.11 g/mol
E)405.27 g/mol

Question 22

What is the molar mass of caffeine,C4H5N₂O?

A)43.03 g/mol
B)97.11 g/mol
C)102.16 g/mol
D)113.11 g/mol
E)116.17 g/mol

Question 23

What is the molar mass of cholesterol,C₂7H₄5OH?

A)30.03 g/mol
B)386.73 g/mol
C)431.78 g/mol
D)432.79 g/mol
E)448.79 g/mol

Question 24

How many moles of argon gas contain 7.52 x 1022 Ar atoms?

A)0.0125 mol
B)0.0801 mol
C)0.125 mol
D)0.801 mol
E)1.25 mol

Question 25

How many formula units of sodium sulfate are in 0.333 mol of Na₂SO₄?

A)2.00 x 1021 formula units
B)2.00 x 1023 formula units
C)2.00 x 1024 formula units
D)5.53 x 1021 formula units
E)5.53 x 1025 formula units

Question 26

Which of the following is equal to 1.00 mole of substance?

A)6.02 x 1023 potassium atoms,K
B)6.02 x 1023 bromine molecules,Br₂
C)6.02 x 1023 potassium bromide formula units,KBr
D)all of the above
E)none of the above

Question 27

What is the molar mass of mercury(II)nitrate,Hg(NO₃)2?

A)246.60 g/mol
B)310.60/mol
C)324.61 g/mol
D)380.65 g/mol
E)525.20 g/mol

Question 28

How many moles of ammonia contain 1.51 x 1024 NH₃ molecules?

A)0.251 mol
B)0.399 mol
C)2.51 mol
D)3.99 mol
E)25.1 mol

Question 29

What is the molar mass of trinitrotoluene (TNT),C7H5(NO₂)3?

A)63.07 g/mol
B)135.13 g/mol
C)189.21 g/mol
D)227.15 g/mol
E)405.39 g/mol

Question 30

Given that P-31 is the only natural isotope of phosphorus,what is the mass of one P atom and the mass of Avogadro's number of P atoms,respectively?

A)30.97 amu and 30.97 g
B)30.97 g and 30.97 amu
C)31 amu and 31 g
D)31 g and 31 amu
E)none of the above

Question 31

How many molecules of methane are in 0.500 mol of CH₄ gas?

A)1.20 x 1023 molecules
B)1.20 x 1024 molecules
C)3.01 x 1022 molecules
D)3.01 x 1023 molecules
E)3.01 x 1024 molecules

Question 32

Given that Au-197 is the only natural isotope of gold,what is the mass of one Au atom and the mass of Avogadro's number of Au atoms,respectively?

A)196.97 amu and 196.97 g
B)196.97 g and 196.97 amu
C)197 amu and 197 g
D)197 g and 197 amu
E)none of the above

Question 33

Which of the following is equal to 1.00 mole of substance?

A)6.02 x 1023 lithium atoms,Li
B)6.02 x 1023 fluorine molecules,F2
C)6.02 x 1023 lithium fluoride formula units,LiF
D)all of the above
E)none of the above

Question 34

How many atoms of krypton are in 2.50 mol of Kr gas?

A)1.5l x 1022 atoms
B)1.51 x 1023 atoms
C)1.51 x 1024 atoms
D)2.41 x 1023 atoms
E)2.41 x 1024 atoms

Question 35

How many moles of potassium nitrate contain 8.68 x 1020 KNO₃ formula units?

A)0.00144 mol
B)0.0144 mol
C)1.44 mol
D)6.94 mol
E)694 mol

Question 36

What is the molar mass of aluminum chlorate,Al(ClO₃)3?

A)277.33 g/mol
B)325.33 g/mol
C)331.29 g/mol
D)421.33 g/mol
E)456.78 g/mol

Question 37

Which of the following is equal to 1.00 mole of substance?

A)6.02 x 1023 sodium atoms,Na
B)6.02 x 1023 iodine molecules,I₂
C)6.02 x 1023 sodium iodide formula units,NaI
D)all of the above
E)none of the above

Question 38

What is the molar mass of mercury(I)nitrate,Hg2(NO₃)2?

A)262.20 g/mol
B)573.20 g/mol
C)621.20 g/mol
D)525.20 g/mol
E)926.38 g/mol

Question 39

What is the molar mass of ammonium dichromate, (NH₄)2Cr₂O₇?

A)238.09 g/mol
B)252.10 g/mol
C)260.18 g/mol
D)372.18 g/mol
E)386.19 g/mol

Question 40

What is the molar mass of aspirin,C9H₈O₄?

A)29.02 g/mol
B)116.08 g/mol
C)180.17 g/mol
D)244.17 g/mol
E)252.25 g/mol

Question 41

What is the mass in grams of a single molecule of oxygen,O₂?

A)1.66 x 10-24 g
B)5.32 x 10-23 g
C)2.66 x 10-23 g
D)1.88 x 1022 g
E)3.76 x 1022 g

Question 42

How many molecules of methane gas,CH₄,have a mass equal to 3.20 g?

A)1.20 x 1023 molecules
B)1.20 x 1024 molecules
C)1.93 x 1024 molecules
D)3.01 x 1023 molecules
E)3.01 x 1024 molecules

Question 43

How many propane molecules are in 22.4 liters of C₃H₈ gas at STP?

A)1.20 x 1024
B)1.35 x 1025
C)1.81 x 1024
D)6.02 x 1023
E)2.69 x 1022

Question 44

What is the mass of 1.20 x 1024 molecules of sulfur dioxide,SO₂?

A)0.0310 g
B)1.99 g
C)32.2 g
D)64.1 g
E)128 g

Question 45

What is the mass in grams of a single formula unit of copper(I)sulfide,Cu2S?

A)1.04 x 10-26 g
B)1.66 x 10-24 g
C)2.64 x 10-22 g
D)3.79 x 1021 g
E)9.57 x 1025 g

Question 46

How many butane molecules are in 22.4 liters of C4H10 gas at STP?

A)1.20 x 1024
B)1.35 x 1025
C)1.81 x 1024
D)6.02 x 1023
E)2.69 x 1022

Question 47

Which of the following gases occupies 22.4 L at STP?

A)1 mol carbon monoxide,CO
B)1 mol ammonia,NH₃
C)1 mol ozone,O₃
D)all of the above
E)none of the above

Question 48

What is the mass of 2.10 x 1021 atoms of copper,Cu?

A)0.00349 g
B)0.101 g
C)0.222 g
D)63.5 g
E)831 g

Question 49

What is the mass in grams of a single molecule of water,H₂O?

A)9.23 x 10-26 g
B)1.66 x 10-24 g
C)2.99 x 10-23 g
D)3.34 x 1022 g
E)1.08 x 1025 g

Question 50

How many formula units of lithium iodide,LiI,have a mass equal to 4.24 g?

A)1.90 x 1025 formula units
B)1.91 x 1022 formula units
C)2.55 x 1024 formula units
D)5.24 x 1023 formula units
E)5.24 x 1026 formula units

Question 51

What is the mass of 4.50 x 1022 atoms of gold,Au?

A)0.0679 g
B)0.0748 g
C)13.3 g
D)14.7 g
E)2640 g

Question 52

How many molecules of bromine liquid,Br₂,have a mass equal to 31.8 g?

A)1.20 x 1023 molecules
B)1.51 x 1024 molecules
C)1.91 x 1025 molecules
D)2.40 x 1023 molecules
E)3.03 x 1024 molecules

Question 53

Which of the following gases occupies 22.4 L at STP?

A)1 mol helium,He
B)1 mol neon,Ne
C)1 mol xenon,Xe
D)all of the above
E)none of the above

Question 54

What is the mass in grams of a single formula unit of silver chloride,AgCl?

A)1.16 x 10-26 g
B)1.66 x 10-24 g
C)2.38 x 10-22 g
D)4.21 x 1021 g
E)8.61 x 1025 g

Question 55

What is the mass of 3.30 x 1023 atoms of silver,Ag?

A)0.549 g
B)25.8 g
C)59.1 g
D)85.7 g
E)197 g

Question 56

What is the mass in grams of a single atom of silver?

A)1.54 x 10-26 g
B)1.66 x 10-24 g
C)1.79 x 10-22 g
D)5.58 x 1021 g
E)6.50 x 1025 g

Question 57

What is the mass in grams of a single atom of carbon?

A)1.38 x 10-25 g
B)1.66 x 10-24 g
C)2.00 x 10-23 g
D)5.02 x 1022 g
E)7.22 x 1024 g

Question 58

What is the mass of 5.55 x 1022 formula units of calcium chloride,CaCl₂?

A)0.0922 g
B)0.0977 g
C)10.2 g
D)10.8 g
E)1200 g

Question 59

Which of the following gases occupies 22.4 L at STP?

A)1 mol hydrogen,H₂
B)1 mol nitrogen,N₂
C)1 mol of oxygen,O₂
D)all of the above
E)none of the above

Question 60

How many ethane molecules are in 22.4 liters of C₂H₆ gas at STP?

A)1.20 x 1024
B)1.35 x 1025
C)1.81 x 1024
D)6.02 x 1023
E)2.69 x 1022

Question 61

If the density of an unknown gas is 1.96 g/L at STP,what is its molar mass?

A)11.4 g/mol
B)19.6 g/mol
C)22.4 g/mol
D)43.9 g/mol
E)196 g/mol

Question 62

What is the volume occupied by 0.155 g of boron trifluoride gas,BF3,at STP?

A)51.2 mL
B)235 mL
C)347 mL
D)469 mL
E)980 mL

Question 63

What is the density of methyl chloride gas,CH₃Cl,at STP?

A)0.444 g/L
B)0.582 g/L
C)1.72 g/L
D)2.25 g/L
E)22.4 g/L

Question 64

What is the density of ozone gas,O₃,at STP?

A)0.467 g/L
B)0.714 g/L
C)1.40 g/L
D)2.14 g/L
E)22.4 g/L

Question 65

What is the density of nitrogen gas,N₂,at STP?

A)0.625 g/L
B)0.800 g/L
C)1.25 g/L
D)1.60 g/L
E)22.4 g/L

Question 66

What is the mass of 2.50 L of sulfur dioxide gas,SO₂,at STP?

A)0.875 g
B)1.14 g
C)7.15 g
D)25.6 g
E)56.0 g

Question 67

What is the volume of 4.80 x 1022 molecules of nitrous oxide gas,N₂O,at STP?

A)1.79 L
B)2.81 L
C)17.9 L
D)179 L
E)281 L

Question 68

What is the volume of 2.75 x 1024 molecules of ammonia gas,NH₃,at STP?

A)0.00977 L
B)0.204 L
C)4.57 L
D)4.90 L
E)102 L

Question 69

How many hydrogen molecules are in 2.75 L of H₂ gas at STP?

A)1.66 x 1024 molecules
B)2.19 x 1023 molecules
C)4.90 x 1024 molecules
D)7.39 x 1022 molecules
E)9.77 x 1021 molecules

Question 70

What is the mass of 5.00 liters of oxygen gas,O₂,at STP?

A)0.286 g
B)3.50 g
C)6.40 g
D)7.14 g
E)112 g

Question 71

What is the volume occupied by 11.0 g of propane gas,C₃H₈,at STP?

A)0.250 L
B)4.00 L
C)5.59 L
D)21.6 L
E)89.6 L

Question 72

What is the density of carbon monoxide gas,CO,at STP?

A)0.714 g/L
B)0.800 g/L
C)1.25 g/L
D)1.40 g/L
E)22.4 g/L

Question 73

What is the density of hydrogen sulfide gas,H₂S,at STP?

A)0.0893 g/L
B)0.659 g/L
C)1.52 g/L
D)11.2 g/L
E)22.4 g/L

Question 74

What is the volume occupied by 10.0 g of nitric oxide gas,NO,at STP?

A)0.333 L
B)7.46 L
C)13.4 L
D)67.2 L
E)224 L

Question 75

What is the volume occupied by 0.750 g of nitrogen gas,N₂,at STP?

A)0.600 L
B)0.938 L
C)16.8 L
D)37.3 L
E)836 L

Question 76

What is the mass of 455 mL of ethane gas,C₂H₆,at STP?

A)0.340 g
B)0.611 g
C)2.95 g
D)10.2 g
E)65.9 g

Question 77

What is the volume of 1.20 x 1022 molecules of nitric oxide gas,NO,at STP?

A)0.0199 L
B)0.447 L
C)2.24 L
D)5.02 L
E)1120 L

Question 78

How many xenon atoms are in 10.0 L of Xe gas at STP?

A)1.35 x 1024 atoms
B)2.69 x 1021 atoms
C)2.69 x 1023 atoms
D)6.02 x 1022 atoms
E)6.02 x 1024 atoms

Question 79

What is the density of fluorine gas,F2,at STP?

A)0.589 g/L
B)0.848 g/L
C)1.18 g/L
D)1.70 g/L
E)22.4 g/L

Question 80

How many carbon dioxide molecules are in 500.0 mL of CO₂ gas at STP?

A)1.34 x 1022 molecules
B)2.23 x 1021 molecules
C)2.23 x 1025 molecules
D)2.70 x 1022 molecules
E)2.70 x 1025 molecules