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Practice Test 5



1.
True or false? The equation N2(g) + 3H2(g) → 2NH3(g) can be interpreted by saying that 1 mol of N2 reacts with 3 mol of H2 to form 2 mol of NH3.
A. True
B. False


2.
True or false? A balanced chemical equation is one that has the same number of moles of molecules on each side of the equation.
A. True
B. False


3.
The balanced equation 2Cu(s) + O2(g) 2CuO(s) tells us that 5.0 mol of Cu
A.
reacts with 5.0 mol of O2
B.
produces 5.0 mol of CuO
C.
must react with 160 g of O2
D.
cannot react with oxygen
E.
produces 10.0 mol of CuO


4.
For the reaction

   

if 6.0 mol of CO2 are produced, how many moles of O2 were reacted?
A.
4.0 mol
B.
7.5 mol
C.
9.0 mol
D.
15.0 mol
E.
none of these


5.
True or false? A mole ratio is used to convert the moles of a starting substance to the moles of a desired substance.
A. True
B. False


6.
Refer to the following equation:      4NH3(g) + 7O2(g) 4NO2(g) + 6H2O(g)

How many moles of ammonia will be required to produce 13.7 mol of water?
A.
5.48 mol
B.
13.7 mol
C.
9.13 mol
D.
6.85 mol
E.
none of these


7.
Refer to the following equation:      4NH3(g) + 7O2(g) 4NO2(g) + 6H2O(g)

How many molecules of NO2 are produced when 7.19 mol of ammonia is completely reacted?
A.
28.76
B.
8.66 × 1024
C.
4.33 × 1024
D.
331
E.
none of these


8.
How many molecules of carbon dioxide will be formed if 4.94 g of propane is burned in the following reaction?

   
A.
8.92 × 1024 molecules
B.
6.75 × 1022 molecules
C.
2.70 × 1023 molecules
D.
2.02 × 1023 molecules
E.
3.37 × 1023 molecules


9.
Calculate the mass of water produced when 8.57 g of methane, CH4, reacts with an excess of oxygen in the following unbalanced reaction.

   
A.
9.62 g H2O
B.
3.09 × 102 g H2O
C.
19.2 g H2O
D.
0.476 g H2O
E.
1.07 g H2O


10.
Consider the reaction

   

If 12.7 g of iron(III) oxide (rust) is produced from a certain amount of iron, how many grams of oxygen are needed for this reaction?
A.
3.82 g
B.
7.63 g
C.
1.70 g
D.
2.54 g
E.
none of these


11.
Methane, CH4, the major component of natural gas, burns in air to form CO2 and H2O. What mass of water is formed in the complete combustion of 3.39e3 g of CH4?
A.
1.22 × 105 g
B.
3.81 × 103 g
C.
1.14 × 104 g
D.
7.61 × 103 g
E.
none of these


12.
How many moles of O2 are required for the complete reaction of 50.6 g of C2H4 to form CO2 and H2O?
A.
0.902 mol
B.
3.61 mol
C.
7.22 mol
D.
5.41 mol
E.
none of these


13.
For the reaction

   

how many grams of NaCl can be produced from 22.5 g of Cl2 and excess NaOH?
A.
27.8 g NaCl
B.
12.4 g NaCl
C.
18.5 g NaCl
D.
9.27 g NaCl
E.
none of these


14.
Sodium and water react according to the equation

   

What number of moles of H2 will be produced when 4.0 mol Na is added to 2.8 mol H2O?
A.
1.4 mol
B.
5.6 mol
C.
2.0 mol
D.
2.8 mol
E.
8.0 mol


15.
How many moles of SbCl3 is formed when 4.00 mol Sb are reacted with 4.70 mol Cl2 according to the unbalanced equation

   
A.
7.05 mol SbCl3
B.
4.70 mol SbCl3
C.
3.13 mol SbCl3
D.
4.00 mol SbCl3
E.
Cannot be determined based on the information given.


16.
Determine the mass of CO2 produced when 66.9 g of CaO is reacted with 50.0 g of C according to the unbalanced equation

   
A.
26.3 g CO2
B.
105 g CO2
C.
52.5 g CO2
D.
36.6 g CO2
E.
none of these


17.
When NH3 is prepared from 28 g N2 and excess H2, the theoretical yield of NH3 is 34 g. When this reaction is carried out in a given experiment, only 23 g is produced. What is the percentage yield? (Ignore significant figures for this problem.)
A.
32%
B.
45%
C.
23%
D.
34%
E.
68%


18.
In the reaction between CO and Fe3O4, the theoretical yield in an experiment is calculated to be 47.2 g Fe. When a careless chemistry student carries out the experiment, the actual yield is 34.4 g Fe. Calculate the percentage yield.
A.
72.9%
B.
27.1%
C.
48.6%
D.
36.4%
E.
none of these


19.
For the reaction

   

if 4.78 g of S is reacted with 10.0 g of O2, how many grams of SO3 will be produced?
A.
23.9 g
B.
5.97 g
C.
16.7 g
D.
11.9 g
E.
none of these


20.
For the reaction of C2H4(g) with O2(g) to form CO2(g) and H2O(g), what number of moles of CO2 can be produced by the reaction of 0.480 mol C2H4 and 1.00 mol O2?
A.
1.50 mol
B.
0.960 mol
C.
0.667 mol
D.
1.00 mol
E.
none of these


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