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27 May, 03:47

Calculate the molar mass of the following using the periodic table:

1.) HCl

2.) ZnF2

3.) K2CO3

4.) FePO4

5.) Cu2S

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Answers (2)
  1. 27 May, 05:20
    0
    I think it depends on what specification your doing as molar mass is the relative atomic mass numbers added on the periodic table and specifications vary in their periodic tables
  2. 27 May, 06:04
    0
    Molar Mass of HCl = 37.466 g/mol Molar Mass of ZnF₂ = 103.386 g/mol Molar Mass of K₂CO₃ = 138.211 g/mol l Molar Mass of FePO₄ = 243.725 g/mol Molar Mass of Cu₂S = 159.157 g/mol

    Explanation:

    Given:

    HCl ZnF₂ K₂CO₃ FePO₄ Cu₂S

    Required:

    Calculate Molar Mass

    Molar mass is the mass of a given substance divided by the amount of that substance, measured in g/mol.

    For a compound, it is calculated by adding the molar mass of each element of the compound

    1. HCl

    This has 1 atom of Hydrogen and 1 atom of chlorine

    The molar mass of HCl is calculated by adding the molar mass of Hydrogen and Chlorine

    Molar Mass of HCl = Molar Mass of Hydrogen + Molar Mass of Chlorine

    Molar Mass of Hydrogen = 2.016 g/mol

    Molar Mass of Chlorine = 35.45 g/mol

    Molar Mass of HCl = 1 * 2.016 g/mol + 1 * 35.45 g/mol

    Molar Mass of HCl = 37.466 g/mol

    2. ZnF₂

    This compound contains 1 atom of Zinc and 2 atom of Florine

    Molar Mass of Zinc = 65.38 g/mol

    Molar Mass of Florine = 18.998 g/mol

    Molar Mass of ZnF₂ = 1 * 65.38 g/mol + 2 * 18.998 g/mol

    Molar Mass of ZnF₂ = 65.38 g/mol + 37.996 g/mol

    Molar Mass of ZnF₂ = 103.386 g/mol

    3. K₂CO₃

    This compound contains 2 atom of Potassium, 1 atom of Carbon and 3 atoms of Oxygen

    Molar Mass of Potassium = 39.10 g/mol

    Molar Mass of Carbon = 12.011 g/mol

    Molar Mass of Oxygen = 16 g/mol

    Molar Mass of K₂CO₃ = 2 * 39.10 g/mol + 1 * 12.011 g/mol + 3 * 16 g/mol

    Molar Mass of K₂CO₃ = 78.20 g/mol + 12.011 g/mol + 48 g/mol

    Molar Mass of K₂CO₃ = 138.211 g/mol

    4. FePO₄

    This compound contains 1 atom of Irom, 1 atom of Phosporus and 4 atoms of Oxygen

    Molar Mass of Iron = 55.845 g/mol

    Molar Mass of Phosporus = 123.88 g/mol

    Molar Mass of Oxygen = 16 g/mol

    Molar Mass of FePO₄ = 1 * 55.845 g/mol + 1 * 123.88 g/mol + 4 * 16 g/mol

    Molar Mass of FePO₄ = 55.845 g/mol + 123.88 g/mol + 64 g/mol

    Molar Mass of FePO₄ = 243.725 g/mol

    5. Cu₂S

    This compound contains 2 atom of Copper and 1 atom of Sulphur

    Molar Mass of Iron = 63.546 g/mol

    Molar Mass of Sulphur = 32.065 g/mol

    Molar Mass of Cu₂S = 2 * 63.546 g/mol + 1 * 32.065 g/mol

    Molar Mass of Cu₂S = 127.092 g/mol + 32.065 g/mol

    Molar Mass of Cu₂S = 159.157 g/mol
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