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WorksheetsStoichiometry
Total questions: 10
Worksheet time: 50mins
Name
Class
Date
1.
Name the given compound - Fe2(CO3)3
a)
iron (II) carbonate
b)
Iron (III) carbonate
c)
Iron carbonate
d)
Iron carbonate (II)
2.
Determine the oxidation number of each green coloured element in the following ion : S2O82-
a)
+7
b)
-2
c)
-1
d)
+6
3.
All alkali metal react with water to produce hydrogen gas and the corresponding alkaline metal hydroxide. A typical reaction is that between lithium and water : 2Li(s) + 2H2O(l) →2LiOH(aq) + H2(g) Calculate the mass of H2 gas formed when 40.0 g of Li react with water [Ar H =1.0, Li = 6.9, O =16.0]
a)
4.21 g
b)
7.31 g
c)
5.80 g
d)
4.42 g
4.
Urea (NH2)2CO is prepared by reacting ammonia with carbon dioxide :
2NH3(g) + CO2(g) → (NH2)CO(aq) + H2O(l)
If 600.0 g of NH3 area allowed to react with 1142 g of CO2, determine mass of excess reactant left at the end of the reaction.
2NH3(g) + CO2(g) → (NH2)CO(aq) + H2O(l)
If 600.0 g of NH3 area allowed to react with 1142 g of CO2, determine mass of excess reactant left at the end of the reaction.
a)
456.01 g
b)
65.09 g
c)
403.21 g
d)
363.88 g
5.
An aqueous solution of MgSO4 is added to an aqueous solution of BaCl2 to form BaSO4 and MgCl2. If 1.75 g of MgSO4 and 2.75 g of BaCl2 are used, calculate the mass of BaSO4 produced after the reactant has completed. [Mr MgSO4 = 120.4; BaCl2 = 208.3; BaSO4 = 233.4; MgCl2 = 95.3]
a)
2.03 g
b)
1.96 g
c)
3.08 g
d)
1.50 g
6.
Balance the following equation in acidic medium
aMnO4-(aq) + bC2O42-(aq) →cMn2+(aq) + dCO2(g) + eH2O(l)
The sum of the coefficient a+b+c+d+d
aMnO4-(aq) + bC2O42-(aq) →cMn2+(aq) + dCO2(g) + eH2O(l)
The sum of the coefficient a+b+c+d+d
a)
43
b)
27
c)
29
d)
25
7.
0.157 g of C6H7NO was used to react with 0.486 g of C4H6O3 to produce C8H9NO2 and CH3COOH. After purification, 0.198 g of C8H9NO2 was extracted. Determine the percentage yield of C8H9NO2. [Ar C : 12.O; H=1.0; N=18; O=16.0]
a)
70.09%
b)
85.62%
c)
91.24%
d)
90.90%
8.
Calculate the mass (in kg) of water produced from the combustion of 1.0 gallon (3.8 L) of gasoline (C8H18). The density of gasoline is 0.79 g/mL [Mr C : 12.0; H : 1.0]
a)
3.33 kg
b)
7.12 kg
c)
4.27 kg
d)
6.57 kg
9.
If 4.50 g of HCl is reacted with 15.0 g of CaCO3 according to the following chemical equation,
2HCl + CaCO3 → CaCl2 + H2O + CO2
Calculate the theoretical yield (in gram) of
CO2
2HCl + CaCO3 → CaCl2 + H2O + CO2
Calculate the theoretical yield (in gram) of
CO2
a)
2.05 g
b)
4.12 g
c)
3.02 g
d)
2.71 g
10.
290.23 mg of ethanol (C2H5OH) is reacted with excess oxygen (O2) to provide 481.11 mg of CO2. What is the percentage yield of CO2 in this reaction?
a)
90.0 %
b)
86.7 %
c)
67.8 %
d)
77.8 %
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