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Stoichiometry Basics
Test Description: Use the balanced chemical equations and the mole relationships you've learned in class to answer the questions.
Instructions: Answer all questions to get your test result.
1) To produce 12 moles of water, how many moles of oxygen gas are needed? 2C2H6 + 7O2 yields 4CO2 + 6H2O
A
7 moles
B
14 moles
C
2 moles
D
9 moles
2) How many liters of oxygen are required to produce 2 liters of water at STP? 2H2 + O2 yields 2H2O
A
4 L
B
2 L
C
1 L
D
3 L
3) If 5.9 moles of carbon react, how many moles of CS2 are produced? 5C + 2SO2 yields CS2 + 4CO
A
1.2 moles
B
1.5 moles
C
30 moles
D
0.077 moles
4) In the following reaction, how many moles of carbon monoxide are needed to react completely with 7.0 moles of oxygen gas? 2CO + O2 yields 2CO2
A
3.5 moles
B
14 moles
C
7.0 moles
D
4.0 moles
5) How many moles of carbon dioxide, can be formed by the decomposition of 5 moles of aluminum carbonate? Al2(CO3)3 yields Al2O3 + 3CO2
A
5 moles
B
10 moles
C
2 moles
D
20 moles
6) How many grams of H2SO4 are needed to produce exactly 11.2 liters of H2, measured at STP? Mg + H2SO4 yields MgSO4 + H2
A
49.0g
B
196g
C
98.0g
D
24.5g
7) How many liters of ammonia are produced when 28.0 grams of nitrogen are completely consumed? N2 + 3H2 yields 2NH3
A
5.60L
B
22.4L
C
11.2L
D
44.8L
8) If 3.50 g of H2S are used, how many grams of water are produced? 2H2S + 3O2 yields 2H2O + 2SO2
A
185g
B
1.85g
C
0.185g
D
0.102g
9) If 0.600g of Zn is used, how many grams of ZnCl2 is produced? Zn + 2HCl yields ZnCl2 + H2
A
0.18g
B
12.5g
C
1.25g
D
0.125g
10) How many molecules of sulfuric acid are produced from 284.1g of sodium sulfate? 2HCl + Na2SO4 yields 2NaCl + H2SO4
A
6.020 x 10 23 molecules
B
2.408 x 10 24 molecules
C
1.204 x 10 24 molecules
D
6.020 x 10 24 molecules
*select an answer for all questions
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