Calculating With Chemical Equations Page 2
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2
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42. Aluminum oxidizes according to the following equation:
à 2Al
4Al + 3O
O
2
2
3
a. ______________ Powdered Al (0.048 mol) is placed into a container containing 0.030 mol O
. What is limiting reactant?
2
b. ______________ How many moles of the excess reactant remain?
[C] Percent Yield Problems
1. ______________ Dichlorine monoxide, Cl
O is sometimes used as a powerful chlorinating agent in research. It can be
2
produced by passing chlorine gas over heated mercury (II) oxide according to the following equation. What is the percent
yield, if the quantity of the reactants is sufficient to produce 0.86g of Cl
O but only 0.71 g is obtained?
2
àHgCl
HgO + Cl
+ Cl
O
2
2
2
2. In the commercial production of the element arsenic, arsenic(III) oxide is heated with carbon, which reduces the oxide to the
metal according to the following equation:
+ 3C à3CO
2As
O
+ 4As
2
3
2
a. ______________ If 8.87g of As
O
is used in the reaction and 5.33 g of As is produced, what is the percent yield?
2
3
b. ______________ If 67 g of carbon is used up in a different reaction and 425g of As is produced, calculate the percent yield
of this reaction.
3. ______________ Huge quantities of sulfur dioxide are produced from zinc sulfide by means of the following reaction. If the
typical yield is 86.78%, how much SO
should be expected if 4897g of ZnS are used?
2
(g) à2ZnO(s) + 2SO
2ZnS(s) + 3O
(g)
2
2
4. ______________ A process by which zirconium metal can be produced from the mineral zirconium (IV) orthosilicate,
ZrSiO
, starts by reacting it with chlorine gas to form zirconium (IV) chloride. What mass of ZrCl
can be produced if 862g
4
4
of ZrSiO
and 950.g of Cl
are available? (You must first determine limiting reactant).
4
2
à ZrCl
ZrSiO
+ 2Cl
+SiO
+ O
4
2
4
2
2
Homework: Calculating with Chemical Equations
2
1/12/15
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