Take Home Discussion Quiz #5
1. (3 points) If 501 grams of Cu(OH2)62+ reacts with 108 grams of ammonia, two products are
formed. One product is water and the other is unknown. How many grams of the unknown
compound will be formed? Assume 100% yield. Hint: You do not need to know the formula for
the unknown compound.
Cu(OH2)62+ (aq)
+
Unknown (aq) + 5 H2O (l)
5 NH3 (aq) (LR)
Initialy:
501g or 2.92 mol
108g or 6.34mol
Used/
Formed
-217.6g or -1.27mo
-108g or -6.34mol
End
283.4g
0g/0mol
?
0
+114.2g or 6.34mol
0g
114.2g
Amount of unknown=(501+108) -289-114=211.4g or 211g or 212g
Amount of Unknown = 211g or 212g g
2.
(3 points) 80. grams of iron(III) oxide and 54 grams of aluminum react to form an elemental
iron and aluminum oxide. In the lab you only manage to get 75% yield.
Initially:
Fe2O3(s)
+
2Al (s)
80.g or 0.50mol
54g or 2mol
Change (100%yeld): -0.5mol or -80g
-1mol or -27grams
Change (75%yeld):
-27g∙0.75=-20.25g
-80g∙0.75= -60g
End:
20g
33.75g
a. How many in grams of the non-limiting reagent remains?
34g
b. How many in grams of the limiting reagent remains?
20. g
c. How many in grams of an elemental iron is formed?
42g
1
2Fe(s)
0
+
+1mol or 56g
56g∙0.75=42g
42g
Al2O3(s)
0
+0.5mol or 51g
51g∙0.75=38g
38g Work must be present to receive any credit. All work has to be done individually.
3. (2points) For each molecule write the molecular shape in the box below:
Trigonal planer
tetrahedral
Trigonal planer
Bent
4. (2 points) Consider the combustion reaction for butane:
C4H10 (l) + O2 (g) CO2 (g) + H2O (g)
If only 132 grams of CO2 was formed and it has a 75% yield what was initial amounts of the
reagents in grams?
132
100 176 g of CO2
75
1molCO2 13molO2
32 g
=208g
176 gCO2
44 gCO2 8molCO2 1molO2
132g is a 75% at 100% yield:
176 gCO2
1molCO2 2molC4 H10
58 g
=58g
44 gCO2 8molCO2 1molC4 H10
Amount of C4H10(l) = 58g
Amount of O2(g) = 208=210 g
2
Take Home Discussion Quiz 5 Chemistry
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