CHEMICAL CALCULATIONS REVIEW
Name___________________ Hr___
1) Determine the percent composition of each element in lead (II) acetate.
2) What is the molar mass of aluminum chromate?
3) Using the data below, calculate the number of sugar (sucrose) molecules in the sugar bowl.
Mass of sugar bowl and sugar--- 35.256grams
sucrose = C12H22O11
Mass of sugar bowl alone--- -----29.239grams
4) What is mass of 6.8 x 1022atoms of platinum?
5) Determine the number of moles in 45.8 g of nitrogen gas.
6) What is the mass (in grams) of 7.5 moles of aluminum carbonate? How many kg is this?
7) What number of molecules is in 4.6 moles of potassium acetate?
8) How many moles are contained in 3.24 x 1025 molecules of magnesium hydroxide?
9) How many molecules is 2.50 grams of sodium phosphate?
10) The empirical formula for the active ingredient in many types of household bleach is OCNCl.
What is the molecular formula for this compound with a molar mass of 232.41g/mol?
11) A sample of tetraethyl-lead, a gasoline additive, is found to contain 64.1 % lead, 29.7 %
carbon and 6.2 % hydrogen. Find the empirical formula.
12) If 4.04 g of phosphorus combine with oxygen to produce 9.24 g of a phosphorus oxide with
a molar mass of 284.0 g/mol, what are the empirical and molecular formulas of this compound?