Unit 2 Quiz--Moles, Mass, and Molecules

Multiple Choice (Choose the best answer.)

  1. What is the mass of one mole of AuCl3?

    96 g

    130 g

    232.5 g

    303.5 g

    626.5 g


  2. What is the mass of one mole of (NH4)2CO3?

    144 g

    138 g

    96 g

    78 g

    43 g


  3. A container of negligible mass is filled first with argon and then with helium. Which statement below would be true about the masses of the two gases (after adjustment for the buoyant effect of air)?

    The mass of the helium would be 1/9th that of argon.

    The mass of the helium would be 1/10th that of argon.

    The mass of helium would be 9x that of argon.

    The mass of helium would be 10x that of argon.

    None of these answers are correct.


  4. 36.0 g of Be contains how many moles?

    0.25 mol

    4.0 mol

    45.0 mol

    320 mol

    2.2 x 1025 mol


  5. 4.0 moles of H2O would have what mass?

    4.5 g

    18 g

    23 g

    68 g

    72 g


  6. 0.075 mol of titanium contains how many atoms?

    1.2 x 10 -25

    3.6

    6.4 x 10 2

    4.5 x 10 22

    2.2 x 10 24


  7. How many moles are there in 2.4 x 10 24 atoms of He?

    2.4 x 10 24 mol

    4.0 mol

    2.0 mol

    6.0 mol

    10.0 mol


  8. One molecule of carbon dioxide has what mass?

    28 g

    44 g

    1.7 x 10 -24 g

    7.3 x 10 -23 g

    4.7 x 10 -23 g


  9. 25 g of AlPO4 contains how many oxygen atoms?

    0.20 O atoms

    1.8 x 10 27 O atoms

    1.5 x 10 25 O atoms

    1.2 x 10 23 O atoms

    4.9 x 10 23 O atoms


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