Deck 3: Equations, the Mole, and Chemical Formulas

Question 1

What is the ratio of A/B where A , B , C , and D represent the coefficients of the balanced equation?
A C₁₀H₂₂ + B O₂→C CO₂ + D H₂O

A) 2/31
B) 3/30
C) 1/13
D) 2/15
E) none of these

Answer 1

2/31

Question 2

What is the ratio of A/B for the equation below where A , B , C , and D represent the coefficients in the balanced equation?
A C₄H₈O + B O₂→C CO₂ + D H₂O

A) 2/5
B) 1/5
C) 1/6
D) 2/11
E) none of these

Answer 2

2/11

Question 3

What is the sum of the coefficients " A + B + C ", where A , B , and C represent the coefficients of the balanced equation?
A P₄ + B O₂→C P₂O₅

A) 3
B) 4
C) 7
D) 8
E) 14

Answer 3

8

Question 4

What is the ratio of A/B where A , B , C , and D are the coefficients in the balanced equation?
A NH₃ + B O₂→C N₂ + D H₂O

A) 1/4
B) 1/3
C) 4/3
D) 3/3
E) none of these

Question 5

What is the sum of the coefficients " A + B + C + D ", where A , B , C , and D represent the coefficients of the balanced equation?
A C₆H₆ + B O₂→C CO₂ + D H₂O

A) 4
B) 16
C) 23
D) 25
E) 35

Question 6

What is the ratio A/B in the balanced equation for the neutralization reaction of HCl with Mg(OH)₂ (you need to supply the products as well as balance)?
A HCl + B Mg(OH)₂→

A) 1/2
B) 2/1
C) 1/1
D) 3/1
E) none of these

Question 7

What is the ratio of A/B for the equation below where A , B , C , and D represent the coefficients in the balanced equation?
A N₂H₄ + B N₂O₄→C N₂ + D H₂O

A) 2/1
B) 1/2
C) 3/1
D) 3/2
E) none of these

Question 8

What is the sum of the coefficients " A + B + C + D ", where A , B , C , and D represent the coefficients of the balanced equation?
A K₂CO₃ + B Al₂Cl₆→C KCl + D Al₂(CO₃)₃

A) 4
B) 5
C) 7
D) 11
E) 15

Question 9

What is the sum of the coefficients " A + B + C + D ", where A , B , C , and D represent the coefficients of the balanced equation?
A Mg₃N₂ (s) + B H₂SO₄ (aq)→C MgSO₄ (aq) + D (NH₄)₂SO₄ (aq)

A) 4
B) 6
C) 8
D) 9
E) 11

Question 10

Which of the following reactions is considered an oxidation-reduction reaction?
I. NH₃ (g) + HCl (g)→NH₄Cl
II. Zn (s) + CuSO₄ (aq)→Cu (s) + ZnSO₄ (aq)
III. 2 K (s) + Cl₂ (g)→2 KCl (s)

A) I only
B) II only
C) III only
D) I and II
E) II and III

Question 11

The reaction HCl + KOH→KCl + H₂O is classified as

A) a neutralization reaction
B) a combustion reaction
C) an oxidation-reduction reaction
D) a precipitation reaction
E) none of these

Question 12

What is the sum of the coefficients " A + B + C + D ", where A , B , C , and D represent the coefficients of the balanced equation?
A C₈H₁₈ + B O₂→C CO₂ + D H₂O

A) 4
B) 19
C) 43
D) 61
E) 122

Question 13

What is the ratio of A/B where A , B , C , and D represent the coefficients of the balanced equation?
A H₂SO₄ + B NaOH→C H₂O + D Na₂SO₄

A) 1/1
B) 1/2
C) 2/1
D) 1/3
E) none of these

Question 14

What is the ratio of A/B where A , B , C , and D represent the coefficients in the balanced equation?
A C₃H₆ + B O₂→C CO₂ + D H₂O

A) 1/3
B) 1/2
C) 3/4
D) 2/9
E) none of these

Question 15

What is the ratio of A/B where A , B , C , and D represent the coefficients in the balanced equation?
A C₃H₆O₂ + B O₂→C CO₂ + D H₂O

A) 1/4
B) 1/3
C) 2/9
D) 3/8
E) none of these

Question 16

What is the sum of the coefficients " A + B + C + D ", where A , B , C , and D represent the coefficients of the balanced equation?
A N₂H₄ + B H₂O₂→C N₂ + D H₂O

A) 4
B) 6
C) 8
D) 11
E) 14

Question 17

What is the sum of the coefficients " A + B + C + D ", where A , B , C , and D represent the coefficients of the balanced equation?
A C₆H₁₄ + B O₂→C CO₂ + D H₂O

A) 4
B) 15
C) 33
D) 35
E) 47

Question 18

What is the ratio of A/B where A , B , C , and D represent the coefficients in the balanced equation?
A Zn + B H₃PO₄→C H₂ + D Zn₃(PO₄)₂

A) 3/1
B) 3/2
C) 6/3
D) 6/4
E) none of these

Question 19

The reaction P₄+ 10 Cl₂→4 PCl₅ is classified as

A) a neutralization reaction
B) a combustion reaction
C) an oxidation-reduction reaction
D) a precipitation reaction
E) none of these

Question 20

What is the ratio of A/B where A , B , C , and D represent the coefficients of the balanced equation?
A Mg₃N₂ + B H₂O→C NH₃ + D Mg(OH)₂

A) 1/6
B) 1/4
C) 2/7
D) 2/9
E) none of these

Question 21

What is the oxidation number of the chlorine in the compound, Ba(ClO₂)₂?

A) 0
B) - 1
C) - 2
D) +3
E) +6

Question 22

What is the oxidation number of the nitrogen in N₂O?

A) +2
B) - 2
C) - 3
D) +1
E) none of these

Question 23

What is the oxidation number of the chlorine in [ClO₄] ^- ?

A) +2
B) - 2
C) +5
D) +7
E) none of these

Question 24

What is the oxidation number for the carbon atom in COCl₂?

A) 0
B) - 2
C) +2
D) +4
E) - 4

Question 25

What is the oxidation number of each oxygen in HNO₃?

A) +3
B) - 2
C) - 3
D) +4
E) none of these

Question 26

What is the oxidation number of the cobalt in CoCl₂?

A) +3
B) - 2
C) - 3
D) +2
E) none of these

Question 27

What is the oxidation number of the chromium atom in the compound, BaCr₂O₇?

A) 0
B) +2
C) +6
D) +7
E) +12

Question 28

What is the oxidation number of the phosphorus in P₄O₁₀?

A) +3
B) +5
C) - 3
D) +4
E) none of these

Question 29

What is the oxidation number of the nitrogen in [NO₃] ^- ?

A) +3
B) - 2
C) +5
D) +4
E) none of these

Question 30

What is the oxidation number of the manganese atom in the formula for the compound KMnO₄?

A) - 1
B) +1
C) +3
D) +5
E) +7

Question 31

What is the oxidation number of the silicon in SiBr₄?

A) +3
B) +2
C) - 2
D) +4
E) none of these

Question 32

What is the oxidation number of the carbon atom in the compound CO?

A) - 4
B) - 2
C) 0
D) +2
E) +4

Question 33

What is the oxidation number of the phosphorus in PCl₃?

A) +3
B) - 2
C) - 3
D) +4
E) none of these

Question 34

What is the oxidation number of the calcium in CaO?

A) +2
B) - 2
C) - 3
D) +1
E) none of these

Question 35

The "super-ion battery" contains K₂FeO₄ as a replacement for MnO₂ in alkaline dry batteries. What is the charge of the iron atom in the compound K₂FeO₄?

A) +2
B) +4
C) +6
D) 0
E) - 4

Question 36

Consider the Acid-Base neutralization of sulfuric acid with sodium hydroxide. NaOH (aq) + H₂SO₄→What products are formed in this neutralization reaction?

A) Na₂S, H₂ and O₂
B) Na₂O and SO₃
C) H₂O₂ and Na₂SO₃
D) H₂O and Na₂SO₄
E) NaH, H₂O and SO₃

Question 37

In which of the following compounds is the oxidation number of the nitrogen atom equal to +5?

A) NH₃
B) N₂O₄
C) NO
D) HNO₃
E) NO₂

Question 38

What is the oxidation number of the phosphorus in PF₃?

A) +3
B) - 2
C) - 3
D) +4
E) none of these

Question 39

Complete and balance the following acid-base neutralization reaction. What are the products with their respective coefficients when exact stoichiometric quantities of reactants are mixed?
__ HBr (aq) + __ Ca(OH)₂→

A) 1 CaBr and 2 H₂O
B) 1 CaBr₂ and 2 H₂O
C) 1 CaBr₂ and 1 H₃O⁺
D) 1 CaBr and 1 H₂O₂
E) 2 HOBr and 1 CaH₂

Question 40

What is the oxidation number of the sulfur in SO₃?

A) +6
B) - 2
C) - 3
D) +3
E) none of these

Question 41

What is the molar mass for calcium nitrate?

A) 54.09 g/mol
B) 86.09 g/mol
C) 102.09 g/mol
D) 132.10 g/mol
E) 164.10 g/mol

Question 42

What is the molar mass of magnesium phosphate?

A) 55.28 g/mol
B) 119.28 g/mol
C) 134.86 g/mol
D) 262.86 g/mol
E) 333.52 g/mol

Question 43

How many grams of sodium sulfide are present in 2.84 moles of sodium sulfide?

A) 3.64×10 ^{- 2} g sodium sulfide
B) 5.16×10 ^{- 2} g sodium sulfide
C) 156 g sodium sulfide
D) 222 g sodium sulfide
E) 403 g sodium sulfide

Question 44

The subscripts in a chemical formula for a compound on the Macroscopic scale represent what?

A) The gram to gram ratio of the elements in the formula
B) The amu to amu ratio of the atoms in the formula
C) The mole to mole ratio of the elements in a formula
D) The charges of each ion in the formula
E) The molar mass of each element in the formula

Question 45

How many moles are present in 14 g NH₃?

A) 0.82 mole
B) 1.0 mole
C) 0.78 mole
D) 0.44 mole
E) none of these

Question 46

How many moles are in 2.3 g of CH₄?

A) 0.14 moles
B) 2.3 moles
C) 0.28 moles
D) 0.47 moles
E) none of these

Question 47

What is the molar mass of lithium carbonate?

A) 18.95 g/mol
B) 50.95 g/mol
C) 66.95 g/mol
D) 73.89 g/mol
E) 126.96 g/mol

Question 48

What is the molar mass of potassium nitrate?

A) 53.11 g/mol
B) 69.11 g/mol
C) 85.11 g/mol
D) 101.10 g/mol
E) 131.31 g/mol

Question 49

How many moles are in 42 g of H₂O?

A) 1.5 moles
B) 4.6 moles
C) 1.2 moles
D) 2.3 moles
E) none of these

Question 50

What is the molar mass of aluminum nitrate?

A) 40.99 g/mol
B) 88.99 g/mol
C) 142.95 g/mol
D) 165.01 g/mol
E) 213.01 g/mol

Question 51

What is the molar mass of sodium phosphate?

A) 53.96 g/mol
B) 99.94 g/mol
C) 117.96 g/mol
D) 147.94 g/mol
E) 163.94 g/mol

Question 52

How many grams of formaldehyde, CH₂O, are present in 5.0×10⁶ molecules of formaldehyde?
Molar Mass(CH₂O) = 30.03 g/mol

A) 2.77×10 ^{- 19} g CH₂O
B) 2.49×10 ^{- 16} g CH₂O
C) 4.01×10¹⁵ g CH₂O
D) 3.61×10¹⁸ g CH₂O
E) 9.03×10³¹ g CH₂O

Question 53

How many moles of sodium chloride are present in 5.84 grams of NaCl?

A) 0.100 mole
B) 10 mole
C) 5.84 mole
D) 341 mole
E) none of these

Question 54

What is the molar mass of iron?

A) 26.00 g/mol
B) 53.00 g/mol
C) 55.85 g/mol
D) 126.9 g/mol
E) 114.8 g/mol

Question 55

How many moles are in 8.0 grams of O₂?

A) 1 mole
B) 0.50 mole
C) 0.25 mole
D) 4.0 moles
E) none of these

Question 56

How many moles are in 19 g of NO₂?

A) 0.63 mol
B) 0.41 mol
C) 2.3 mol
D) 1.2 mol
E) none of these

Question 57

What is the molar mass of calcium phosphate?

A) 71.05 g/mol
B) 119.05 g/mol
C) 135.05 g/mol
D) 310.18 g/mol
E) 365.07 g/mol

Question 58

What is the molar mass of potassium sulfate?

A) 63.04 g/mol
B) 71.16 g/mol
C) 135.16 g/mol
D) 158.01 g/mol
E) 174.26 g/mol

Question 59

How many moles are present in 5.00 grams of CO₂?

A) 8.31×10 ^{- 24} moles of CO₂
B) 0.114 moles of CO₂
C) 220 moles of CO₂
D) 6.84×10²² moles of CO₂
E) 3.01×10²⁴ moles of CO₂

Question 60

How many moles of N₂O are present in 10.0 g of N₂O?

A) 0.227 mole
B) 0.333 mole
C) 0.455 mole
D) 220 mole
E) 440 mole

Question 61

How many moles of sodium ions, Na⁺, are present in 5.63 grams of sodium sulfate, Na₂SO₄?

A) 3.96×10 ^{- 2} moles Na⁺ ions
B) 7.92×10 ^{- 2} moles Na⁺ ions
C) 12.6 Na⁺ ions
D) 400 Na⁺ ions
E) 1.60×10³ Na⁺ ions

Question 62

How many grams of oxygen, O, are present in 20.0 g of CO₂?

A) 3.64 g O
B) 7.27 g O
C) 14.5 g O
D) 27.5 g O
E) 55.0 g O

Question 63

What is the percentage by mass of carbon (to two significant figures) in C₄H₈O?

A) 77%
B) 84%
C) 41%
D) 58%
E) none of these

Question 64

What is the percentage by mass of chromium (to two significant figures) in Cr₂S₃?

A) 40%
B) 52%
C) 62%
D) 71%
E) none of these

Question 65

What is the mass in grams of 557 copper atoms?

A) 1.46×10 ^{- 23} g of Cu
B) 5.88×10 ^{- 20} g of Cu
C) 3.54×10⁴ g of Cu
D) 5.28×10²⁴ g of Cu
E) 2.13×10²⁸ g of Cu

Question 66

How many formula units of KBr are present in 1.19 grams of KBr?

A) 1.98×10 ^{- 24} formula units of KBr
B) 2.35×10 ^{- 22} formula units of KBr
C) 1.0×10 ^{- 2} formula units of KBr
D) 6.02×10²¹ formula units of KBr
E) 7.16×10²³ formula units of KBr

Question 67

What is the mass of 12.04×10²³ atoms of O?

A) 8.0 g
B) 16 g
C) 32 g
D) 17 g
E) none of these

Question 68

What is the mass in grams of 3.0×10¹⁵ atoms of C?

A) 5.0×10 ^{- 9} g
B) 6.0×10 ^{- 8} g
C) 2.4×10⁹ g
D) 3.6×10¹⁶ g
E) none of these

Question 69

How many phosphorus atoms are present in 0.10 mole of Na₄P₂O₇?

A) 0.10 atoms
B) 0.20 atoms
C) 6.0×10²² atoms
D) 1.2×10²³ atoms
E) none of these

Question 70

What is the percentage of nitrogen (to two significant figures) in C₆H₈N?

A) 15%
B) 11%
C) 18%
D) 6.6%
E) none of these

Question 71

What is the percentage of carbon (to two significant figures) in C₂H₆O₂?

A) 31%
B) 39%
C) 27%
D) 44%
E) none of these

Question 72

How many moles of H are present in 2.5 moles of CH₄?

A) 0.50 mol
B) 0.63 mol
C) 2.5 mol
D) 10 mol
E) none of these

Question 73

How many molecules are in 29 g of CH₄?

A) 1.1×10²³ molecules
B) 3.3×10²³ molecules
C) 1.1×10²⁴ molecules
D) 3.3×10²⁴ molecules
E) none of these

Question 74

How many molecules of CO₂ are present in 20.0 g of CO₂?

A) 1.46×10 ^{- 21} molecules
B) 6.84×10²⁰ molecules
C) 2.74×10²³ molecules
D) 6.02×10²³ molecules
E) 1.32×10²⁴ molecules

Question 75

How many molecules of glucose, C₆H₁₂O₆, are present in 18.0 grams of glucose?

A) 0.10 molecules
B) 10 molecules
C) 6.022×10²² molecules
D) 6.022×10²⁴ molecules
E) none of these

Question 76

How many sulfur atoms are present in 10.0 grams of Sulfur?

A) 5.18×10 ^{- 25} atoms
B) 5.33×10 ^{- 22} atoms
C) 0.312 atoms
D) 1.88×10²³ atoms
E) 1.93×10²⁶ atoms

Question 77

What is the mass of 2.2×10²⁴ molecules of C₂H₄?

A) 1.0×10 ^{- 2} g
B) 10 g
C) 77 g
D) 1.0×10² g
E) none of these

Question 78

How many atoms are present in 2.7 g of B?

A) 1.5×10²³
B) 3.0×10²³
C) 8.2×10²²
D) 9.6×10²²
E) none of these

Question 79

What is the mass of 3.0×10²³ molecules of H₂S?

A) 32 g
B) 34 g
C) 16 g
D) 17 g
E) none of these

Question 80

What is the percentage of carbon (to three significant figures) in C₆H₁₂N?

A) 68.4%
B) 61.2%
C) 73.5%
D) 83.2%
E) none of these