Quiz 11 Introductory General Chemistry Ch. 9

Answer the questions below and then click "submit" to send your answers.

  1. How many moles of Mg are in 2.2 moles of Mg3(PO4)2?

    2. Your answer:
    2.2 moles
    6.6 moles
    1.5 moles
    4.4 moles

  2. Determine the mass of 0.17 moles of PCl3. P = 30.97 amu, Cl = 35.45 amu

    3. Your answer:
    23.3 g
    17.1 g
    2.89 g
    8.97 g

  3. What is the mass% of H in CH2O? C = 12.01 amu, H = 1.008 amu, O = 16.00 amu

    4. Your answer:
    45.6%
    23.4%
    6.71%
    14.5%

  4. Calculate the grams of KCl in a solution having molarity of 3.4 M and the volume of 300 ml. 1 L = 1000m. K = 39.10 amu, Cl = 35.45 amu

    5. Your answer:
    122. g
    10. g
    12.3 g
    76. g

  5. A componud has the molar mass of 152 g/mole, 68.42% Cr and 31.58% O by mass. What is the molecular formula of this compound? Cr = 52.00 amu, O = 16.00 amu

    6. Your answer:
    CrO
    none of these answers
    Cr2O3
    CrO3

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