Chemical Quantities
For the 1987 Copyright of The Addison Wesley Textbook
6.02 x 10^23 atoms." Rewrite the statement to make it correct.
2) What is the difference between an empiracle formula and a molecular formula?
3) Find the atomic mass or gram formula mass for each of teh following:
a. Mn
b. Se
c. barium bromide
d. NaOH
4) Find the number of moles in each of the following:
a. 25.0 g Ar
b. 38.6 g magnesium
c. 182.7 g Fe
d. 67.6 g water
e. 264.5 g calcium hydroxide
f. 76.5 g sulfur trioxide
5) Find the mass of each of the following:
a. 3.2 moles Li
b. 0.76 mol Ne
c. 0.882 mol oxygen
d. 1.62 moles of calcium carbonate
6) Find the number of representative particles in each of the following:
a. 0.28 mol Ni
b. 1.84 mles sulfur
c. 0.116 mol nitrogen dioxide
d. 1.32 moles fluorine
7) Find the volume of each of the following amounts of gas at STP:
a. 0.72 mol oxygen
b. 57 grams of carbon dioxide
8) How many moles are in each of the following volumes of gas at STP?
a. 83.5 L carbon dioxide
b. 15.8 L ammonia
c. 55.2 L helium
9) If gold is selling for $320 per ounce, how many atoms of gold can you by for 1 penny?
(1 ounce = 31.1g)
10. a. Determine the percent composition of calcium carbonate.
b. How many grams of calcium would be produced from the decomposition of 200g
of calcium carbonate?
11. Find teh empirical formula for a compound which contains 6.5 g potassium, 5.9 g
chlorine, and 8.0 g oxygen.
12. The explosive, TNT, is composed of 37.0% carbon, 2.20% hydrogen, 18.5% nitrogen
and 42.3% oxygen.
a. Determine the empirical formula for TNT.
b. Teh molar mass for TNT is 227 g/mol. What is the molecular formula for TNT?
