Calculating Relative Masses

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Periodic Table Quizzes & Trivia

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Refer to the Periodic Table to answer the questions,.

Questions and Answers
  • 1. 

    Calculate the relative molecular mass of HF.

    Explanation
    1 + 19 = 20

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  • 2. 

    Calculate the relative molecular mass of NH3.

    Explanation
    14 + 1 x 3 = 17

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  • 3. 

    Calculate the relative formula mass of CaO.

    Explanation
    40 + 16 = 56

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  • 4. 

    Calculate the relative formula mass of K2O.

    Explanation
    39 x 2 + 16 = 94

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  • 5. 

    Calculate the relative formula mass of Na2SO4.

    Explanation
    23 x 2 + 32 + 16 x 4 = 142

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  • 6. 

    Calculate the relative formula mass of Mg(OH)2.

    Explanation
    24 + (16 + 1) x 2 = 58

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  • 7. 

    Calculate the relative formula mass of (NH4)2CO3.

    Explanation
    (14 + 1 x 4) x 2 + 12 + 16 x 3 = 102

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  • 8. 

    Calculate the relative formula mass of FeSO4.7H2O.

    Explanation
    56 + 32 + 16 x 4 + 7 x (1 x 2 + 16) = 278

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  • 9. 

    Metal M forms a sulfate ion with the formula MSO4, which has a relative formula mass of 136. Calculate the relative atomic mass of metal M.

    Explanation
    136 - (32 + 16 x 4) = 136 - 96 = 40

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  • 10. 

    Metal X forms a sulfate ion with the formula Cu(XO3)2, which has a relative formula mass of 414. Calculate the relative atomic mass of metal X.

    Explanation
    414 - 64 = 350
    350/2 = 175
    175 - (16 x 3) = 127

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  • Current Version
  • Mar 21, 2022
    Quiz Edited by
    ProProfs Editorial Team
  • Apr 25, 2010
    Quiz Created by
    Cheers_fu

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