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6.E: Homework Chapter 6 Answers

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    202160
  • Conversion Factors

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

    The Mole Concept

    7. a) 13.6 mol As                     b) 0.0732 mol Ne                    c) 1.12 mol Li                           d) 3.49 x 10-3 mol S

    9.  a) 35.4 mol He                   b) 0.0606 mol Ga                    c) 1.000 mol Mg                      d) 1.73 mol Cu

    11. Complete the table:

    Element

    Moles

    Number of Atoms

    P

    13.2

    7.95 x 1024 P atoms

    Au

    0.222

    1.34 x 1023 Au atoms

    F

    8.34

    5.02 x 1024

    Be

    0.329

    1.98 x 1023

     

    13. Complete the table:

    Element

    Moles

    Mass

    N

    5.38

    75.4g

    W

    0.0756

    13.9g

    Ge

    0.00784

    0.569g

    Rb

    4.09

    350g

     

    15. Complete the table:

    Element

    Moles

    Mass

    Li

    244

    1. 69 x 103g

    Y

    0.653

    58.1g

    B

    1.91

    20.7g

    He

    0.00106

    0.00422g

     

    17. a) 3.30 x 1023 Al atoms                                          c) 1.94 x 1022 Co atoms

    b) 5.98 x 1022 Ca atoms                                                d) 5.01 x 1023 S atoms

     

    19. Complete the table:

    Element

    Mass

    Moles

    Number of Atoms

    Sn

    433g

    3.65

    2.20 x 1024

    Xe

    12.9g

    0.0983

    5.92 x 1022

    H

    65.5mg

    0.0650

    3.91 x 1022

    Si

    203g

    7.22

    4.35 x 1024

     

    21. Complete the table:

    Element

    Mass

    Moles

    Number of Atoms

    Be

    226mg

    0.0251

    1.51 x 1022

    S

    0.0392g

    0.00122

    7.36 x 1020

    Nb

    9.66g

    0.104

    6.26 x 1022

    N

    0.00391kg

    0.279

    1.68 x 1022

     

     

    23. a) 783g NaCl                      b) 1.03 x 104g NO2                        c) 0.807g BBr3                                   d) 28.1g XeO4

    25. Complete the table:

    Compound

    Mass

    Moles

    Number of Molecules

    H2SO4

    188kg

    1.92 x 103

    1.15 x 1027

    NaBr

    32.7g

    0.318

    1.91 x 1023

    KClO3

    4.05mg

    3.3 x 10-5

    1.99 x 1019

    NH3

    121g

    7.10

    4.28 x 1024

     

    27. Complete the table:

    Compound

    Mass

    Moles

    Number of Molecules

    CH4

    55.3g

    3.45

    2.08 x 1024

    NaOH

    42.2mg

    0.00106

    6.35 x 1020

    LiCl

    0.0911g

    0.00215

    1.29 x 1021

    AgNO3

    311g

    1.83

    1.10 x 1024

     

    29. a) 46.5g KCN                     b) 1.68 x 104g FeCl3                    c) 3.20g HF                  d) 5.39 x 10-4g CO2

    31. 4.2 x 1018 CuS form. units

    33. 1.2 x 1014 C6H6 form. units

    Chemical Formulas as Conversion Factors

    35. a) 2.88 mol H                    b) 0.0298 mol H                      c) 0.00 mol H              d) 0.180 mol H

    37. a) 2.8 x 103kg Li2SO4        b) 1.2 x 103kg LiOH               c) 4.4 x 102kg LiBr

    39. a) 1.8 x 103kg NaCl         b) 1.6 x 103kg Na2CO3                   c) 1.7 x 103kg Na3PO4

    41. 7.48 mol NH4OH has the greatest number of moles of hydrogen.

    Mass Percent Composition

    43. 37.49% C, 11.00% H, 29.29% O, 22.22% N

    45. a) 48.00% O                      b) 49.95% O               c) 40.00% O                     d) 56.11% O

    47. a) 1.19% H, 41.97% Cl, 56.83% O

    b) 57.45% Ag, 42.55% Br

    c) 68.32% Pb, 10.57% S, 21.10% O

    d) 74.87% C, 25.13% H

     

    Calculating Empirical Formulas

    49. Empirical Formula: C3H6O

    51. Empirical Formula:

    53. Empirical Formula:

    Calculating Molecular Formulas

    55.

    a) Molecular Formula: C5O10H5

    b) C3Cl3N3

    c) C4H6O2

    d) C8H16O2

     

    57. a) Molecular Formula: C18H24O3

    b) Molecular Formula: C4H8N8O8

    c) Molecular Formula: C2H7NS

    d) Molecular Formula: C22H44O2

    Challenge Problems

    59. Complete the table:

    Substance

    Mass

    Moles

    Number of Particles

    CdF2

    5.85g

    0.0389

    2.34 x 1022

    N

    17.3mg

    0.00123

    7.44 x 1020

    Ag

    1.02kg

    9.46

    5.69 x 1024

    HNO3

    0.476g

    0.00756

    4.55 x 1021

     

    61. Molecular Formula: C12H8Cl6

    63. Molecular Formula: C3H6O3

    Name: Lactic Acid

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