Collier Chemistry
Worksheet 7: Molecular Weight and Mole Conversion
**All answers should be in correct number of significant digits.**
I. Calculate the molecular weight of the following compounds.
A. Calcium hydroxide D. Sulfurous acid
B. Aluminum sulfate E. Potassium dichromate
C. Sodium sulfate F. Hydrobromic acid
II. Calculate the percentage composition of each compound in # I.
III. Calculate the number of moles in each of the following.
A. 41.80 g of Phosphoric Acid D. 281.89 g of Magnesium perchlorate
B. 12.3 g of Chromic Acid E. 18.588 g of Sulfur trioxide
C. 9.45 g of Zinc bicarbonate F. 159.5 g of Aluminum nitrate
IV. Calculate the number of grams of each of the following.
A. 1.23 moles of Sulfuric Acid
B. 0.0089 moles of Barium acetate
C. 4.45 X 101 moles of Ammonium chloride
D. 12.6 moles of Calcium oxide
E. 300.00 moles of Carbonic Acid
F. 3.10 X 101 moles of Carbon tetrachloride
V. Calculate the number of atoms or molecules in each of the following.
A. 4.67 grams of Lithium carbonate
B. 12.8 grams of Iron (III) sulfide
C. 210.7 grams of Silver
D. 1.89 X 105 grams Calcium carbonate
E. 3.56 X 1010 grams of Barium chloride
F. 7.2 X 102 moles of Potassium permanganate
VI. Calculate the number of grams of each of the following.
A. 1.23 X 1024 molecules of Oxalic acid
B. 3.0 X 1022 molecules of Chromium oxide
C. 2.56 X1025 atoms of Lead
D. 8.13 X 1024 molecules of Diarsenic pentachloride
E. 2.76 X 1023 atoms of Gold
F. 4.280 X 1020 molecules of Nitrous Acid
