1. Basic Stoichiometry Problems
Please use these examples to solve today’s problems

2. Example #1
If 35.80g of aluminum chloride reacts with excess silver nitrate, how many grams of the ppt will be formed?
1AlCl3(aq) + 3AgNO3(aq) Al(NO3)3(aq) + 3AgCl(s)
35.80g AlCl mol AlCl mol AgCl g AgCl
132.76g AlCl mol AlCl mol AgCl
= 115.9g AgCl

3. Example #2
15.0ml of a 3.0M magnesium chloride solution reacts with excess silver nitrate, how many grams of ppt will be formed?
1 MgCl2(aq) + 2 AgNO3(aq) Mg(NO3)2(aq) + 2AgCl(s)
15.0ml 1 Liter mole MgCl mol AgCl g AgCl
1000l liter mol MgCl mol AgCl
= 12.9g AgCl

4. Example #3
12.01g of ammonium carbonate reacts with excess ferrous bromide. How many grams of the ppt will be formed?
1(NH4)2CO3(aq) + FeBr2(aq) 2NH4Br(aq) + 1FeCO3 (s)
12.01g(NH4)2CO3 1mol (NH4)2CO3 1mol FeCO g
96.11g mol (NH4)2CO mol FeCO3
= 14.48g FeCO3