Molecules and Compounds Homework Problem Set

This problem set was developed by S.E. Van Bramer for Chemistry 145 at Widener University.


  1. For the following molecules; write the chemical formula, determine how many atoms are present in one molecule, determine the molecular weight, determine the number of moles in exactly 1 gram, and the number of moles in exactly 10-6 gram.
    1. carbon dioxide
    2. iron (II) chloride
    3. zinc (I) oxide
    4. dinitrogen pentoxide
    5. potassium fluoride
    6. dihydrogen monoxide
    7. iron (III) sulfate
    8. lithium acetate

  2. Name the following compounds, determine the molecular weight, determine the percent composition, and determine how many moles in 8.35 grams of the compound.
    1. KI
    2. CaF2
    3. Cu2SO4
    4. Cr(NO3)6
    5. NO
    6. NO2
    7. N2O
    8. N2O4
    9. LiOH
    10. SO2

  3. Give the chemical formula (or atomic symbol), molecular (or atomic) weight, and charge for the following ions:
    1. sulfate
    2. sulfite
    3. nitrate
    4. hydroxide
    5. nitrite
    6. chloride
    7. nitride
    8. bromide
    9. acetate
    10. carbonate

  4. Calculate the number of moles in:
    1. 20.1797 g of Ne
    2. 45.3594 g of Ne
    3. 0.198669 g of Ne
    4. 0.198669 g of Ta

  5. Calculate the mass of:
    1. 1.00 mol of Fe
    2. 2.00 mole of Fe
    3. 4.362 x 10-5 mol of Fe
    4. 4.362 x 10-5 mol of Li


Please send comments or suggestions to svanbram@science.widener.edu

Scott Van Bramer
Department of Chemistry
Widener University
Chester, PA 19013

© copyright 1996, S.E. Van Bramer
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Last Updated: Saturday, May 18, 1996