Changing Mass To Moles And Moles To Mass

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  • 1/10 Questions

    How many grams of Calcium are present in 2.3 moles?

    • 92.18 g
    • 24.02 g
    • 40.08 g
    • 80.16 g
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Mass Quizzes & Trivia
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How many grams of Calcium are present in 2.3 moles of calcium?

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  • 2. 

    How many grams of NaCl is present in 6.3 moles?

    • 58.44 g

    • 368.17 g

    • 231.2 g

    • 9.27 g

    Correct Answer
    A. 368.17 g
    Explanation
    Grams will be a larger number than moles.
    So, to calculate moles and MULTIPLY it by molar mass.
    (Hint: Think multiplication to get a larger number).
    1St: Find the molar mass of NaCl: Na 22.99 + 35.45 = 58.44 g
    2nd: Multiply the number of moles by the molar mass: 6.3 x 58.44 g/mol = 368.17

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  • 3. 

    How many grams are in 2.3 moles of Na2SO4? (The molar mass of Na2SO4 is 142.05g/mol)

    • 61.76 g

    • 326.72 g

    • 163.36 g

    • 81.68 g

    Correct Answer
    A. 326.72 g
    Explanation
    Grams will be a larger number than moles.
    So, to calculate moles and MULTIPLY it by molar mass.
    Multiply the number of moles by the molar mass: 2.3 x 142.05 g/mol = 326.72 g

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  • 4. 

    How many grams of NH­3  are in 9.2 moles? (The molar mass of NH3= 17.03 g/mol)

    • 1.85 g

    • 19.25 g

    • 156.68 g

    • 123.83 g

    Correct Answer
    A. 156.68 g
    Explanation
    Grams will be a larger number than moles.
    So, to calculate moles and MULTIPLY it by molar mass.
    Multiply the number of moles by the molar mass: 9.2 x 17.03 = 156.68 g

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  • 5. 

    How many grams of LiCl are in 6.7 moles? (The molar mass of LiCl = 42.39 g/mol)

    • 42.39 g

    • 6.33 g

    • 239.01 g

    • 284.01 g

    Correct Answer
    A. 284.01 g
    Explanation
    Grams will be a larger number than moles.
    So, to calculate moles and MULTIPLY it by molar mass.
    Multiply the number of moles by the molar mass: 6.7 x 42.39 g/mol = 284.01 g

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  • 6. 

    How many moles of LiBr are there in 486.30 g of LiBr? (The molar mass of LiBr = 86.84 g/mol)

    • 5.6 moles

    • 42,230.292 moles

    • 193.2 moles

    • 3.0 moles

    Correct Answer
    A. 5.6 moles
    Explanation
    Moles will always be a SMALLER number than grams.
    So, to calculate: Take the grams DIVIDE by molar mass.
    (Hint: Think division generally gives us a smaller number, multiplication generally gives us a larger number).
    485.30 grams divided by the molar mass (86.84) = 5.6 moles

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  • 7. 

    How many moles are there in 814.504 g of H2O?

    • 14,677.36 moles

    • 20.2 moles

    • 45.2 moles

    • 3,214.52 moles

    Correct Answer
    A. 45.2 moles
    Explanation
    Moles will always be a SMALLER number than grams.
    So, to calculate: Take the grams DIVIDE by molar mass.
    (Hint: Think division generally gives us a smaller number, multiplication generally gives us a larger number).
    Molar mass of water: Hydrogen 2(1.01) + Oxygen 1 (16.00) = 18.02 g/mol
    Divide grams 814.504 g by molar mass (18.02) = 45.2 moles

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  • 8. 

    How many moles of CO2 are there in 171.639 g of CO­2?

    • 44.01 moles

    • 3.9 moles

    • 7,5553.83 moles

    • 130.22 moles

    Correct Answer
    A. 3.9 moles
    Explanation
    Moles will always be a SMALLER number than grams.
    So, to calculate: Take the grams DIVIDE by molar mass.
    (Hint: Think division generally gives us a smaller number, multiplication generally gives us a larger number).
    Molar mass of CO2 = Carbon (12.01) + Oxygen 2(16.00) = 44.01 g/mol
    Divide grams 171.639 by molar mass (44.01) = 3.9 moles

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  • 9. 

    How many moles of K­2O are in 367.38 g of K2O?

    • 34,607.2 moles

    • 367.38 moles

    • 3.9 moles

    • 5.9 moles

    Correct Answer
    A. 3.9 moles
    Explanation
    Moles will always be a SMALLER number than grams.
    So, to calculate: Take the grams DIVIDE by molar mass.
    (Hint: Think division generally gives us a smaller number, multiplication generally gives us a larger number).
    Molar mass of K2O = Potassium 2 (39.1) + Oxygen (16.00) = 94.2 g/mol
    Divide grams 367.38 by molar mass (94.2 g/mol) = 3.9 moles

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  • 10. 

    How many moles of AlCl3 are there in 1,119.972 g?

    • 8.4 moles

    • 16.8 moles

    • 32,739.04 moles

    • 6.2 moles

    Correct Answer
    A. 8.4 moles
    Explanation
    Moles will always be a SMALLER number than grams.
    So, to calculate: Take the grams DIVIDE by molar mass.
    (Hint: Think division generally gives us a smaller number, multiplication generally gives us a larger number).
    Molar mass of AlCl3= Aluminum (26.98) + Chlorine 3(35.45) = 133.33 g/mol
    Divide the grams 1,119.972 by the molar mass 133.33g/mol = 8.4 moles

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jul 30, 2010
    Quiz Created by
    Kwchiro

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