6.1 Practice Problems

Attempt these problems as if they were real exam questions in an exam environment.

Only look up information if you get severely stuck. Never look at the solution until you have exhausted all efforts to solve the problem. Having to look up information or the solution should be an indicator that the previous layers (1–5) in the Structured Learning Approach have not been mastered.


  1. What is the mass percent of oxygen in glucose (C6H12O6)?

    1. 16.0%
    2. 82.2%
    3. 53.2%
    4. 6.7%
    5. 40.0%

    Solution


  2. An unknown compound was found to contain 79.85% C and 20.15% H with a molar mass of 30.08 g mol–1. What is the empirical formula of the compound?

    1. C2H6
    2. CH3
    3. C4H10
    4. CH4
    5. C2H2

    Solution


  3. You measure 50.0 grams of zinc(II) oxide and dissolve it in water to a final volume of 500 mL of solution. What is the molarity of this solution?

    1. 1.53
    2. 1.23
    3. 0.252
    4. 0.810
    5. 2.20

    Solution


  4. The molecular formula of glucose is C6H12O6. What is the percent composition by mass of carbon in glucose?

    1. 39.99%
    2. 6.72%
    3. 53.28%
    4. 3.77%
    5. Impossible to say without knowing the mass of the sample.

    Solution


  5. What is the initial concentration (in M) of a 3.04 L solution that was diluted to 4.43 L with a final concentration of 2.2 M?

    1. 3.2
    2. 6.12
    3. 2.2
    4. 6.1
    5. 29.6

    Solution