1.When iron (II) hydroxide is mixed with phosphoric acid, iron (II) phosphate precipitate results. 3Fe(OH)2 (aq) + 2H3PO4 (aq) ­> Fe3(PO4)2 (s) + 6H2O (l)
a. If 3.20 g of Fe(OH)2 is treated with 2.50 g of phosphoric acid, what is the limiting reactant?
b. How many grams of Fe3(PO4)2 precipitate can be formed? c. If 3.99 g of Fe3(PO4)2 is actually obtained, what is the percent yield? 2. When copper (II) chloride reacts with sodium sulfide, copper (II) sulfide and sodium chloride are formed:
CuCl2(aq) + Na2S(aq) à CuS(s) + 2NaCl(aq)
a. If 15 grams of copper (II) chloride react with 20 grams of sodium sulfide how much sodium chloride can be formed?
b. What is the limiting reactant for the reaction in #2? __________________
c) If 11.3 grams of sodium chloride are formed in the reaction described in problem #2, what is the percent yield of this reaction?
3) The combustion of liquid ethanol (C2H5OH) produces carbon dioxide and water.
C2H5OH (l) + 3O2 (g) à 2CO2 (g) + 3H2O (l)
a. If 3.88 g of ethanol was allowed to burn in the presence of 12.5 g of oxygen gas, then determine the limiting reactant.
b. How many grams of water and carbon dioxide are formed (theoretical yield)?
c. If a student runs this reaction and collects 3.10 g of water, then what is the percent yield
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