Chem. IA Stoichiometry Practice Worksheet
Name________________________
1. Nitrogen trichloride gas reacts with water to form ammonia gas and hypochlorous acid
(the main ingredient in bleach)
a) Write the balanced equation for this reaction.
b) How many moles of ammonia are produced from 275g of water?
c) How many grams of nitrogen chloride are required to produce 14.8g of ammonia?
2. Iron (III) oxide is heated with an excess of coke (carbon) to produce iron metal and
carbon monoxide.
a) How many moles of iron oxide are required to form 12.79mol of iron?
b) How many grams of carbon monoxide are formed from 13.68g of coke.
3. A thirsty chemist wanders in the Sahara desert and comes across an abandoned
gasoline unit left by World War II. The chemist burns some gasoline to produce water
vapor, trapping the liquid in a long tube. If the formula of gasoline is C8H18
(Assume 100% efficiency)
a) If 180mL of water is produced how many grams of gasoline did he burn?
b) What is the volume of gasoline burned if the density of gasoline 0.700 g/mL
Chem. IA Empirical Formula Practice Problems
4. Dimethyl hydrazine, the fuel used in Apollo lunar module has a molar mass of 60.10
g/mol. It is made up of carbon, hydrogen & nitrogen atoms. The combustion of 2.859 g of
the fuel in excess oxygen yields 4.190g of CO2 and 3.428g of H2O.What is the simplest
formula for dimethyl hydrazine?
5. Dimethyl nitrosamine is a known carcinogen. It is made up of carbon, hydrogen,
nitrogen and oxygen atoms. A 4.319 g of this sample is burned in oxygen to yield 5.134g
of CO2 and 3.151g of water. The compound contains 37.82% of nitrogen by mass. What
is the empirical formula of this compound?