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- 1. Multiple Choice
In the equation 2 Al2O3 --> 4 Al + 3 O2, what is the mole ratio of aluminum to oxygen (aluminum is asked for, oxygen is given)?
10/6
3/4
4/3
2/3
- 2. Multiple Choice
In the reaction 2 H2 + O2 → 2 H2O what is the mole ratio of oxygen to water
1/2
2/1
3/4
4/3
- 3. Multiple Choice
What is the molar mass of table salt (NaCl)?
116.89 g/mol
35.45 g/mol
22.99 g/mol
58.44 g/mol
- 4. Multiple Choice
What is the molar mass of NaOH?
40.00 g/mol
38.99 g/mol
23.99 g/mol
57.00 g/mol
- 5. Multiple ChoiceN2 + 3H2 → 2NH3
How many moles of hydrogen are needed to react with 2 moles of nitrogen?6231 - 6. Multiple Choice2H2 + O2 → 2H2O
How many moles of water can be produced if 8 moles H2 are used?4 moles8 moles16 moles2 moles - 7. Multiple Choice
2NaClO3 (s) → 2NaCl (s) + 3O2 (g)
12.00 moles of NaClO3 will produce how many grams of O2?
NaClO3 = 106.44 g/mol ; O2 = 32.00 g/mol
256 g of O2
576 g of O2
288 g of O2
384 g of O2
- 8. Multiple Choice
Cl2 + 2KBr → Br2 + 2KCl
How many grams of potassium chloride (KCl) can be produced from 356 g of potassium bromide (KBr)?
KCl = 74.55 g/mol ; KBr = 119.00 g/mol
749 g
223 g
479 g
814 g
- 9. Multiple Choice
From the reaction: B2H6 + 3O2 -->2 HBO2 + 2 H2O
What mass of O2 will be needed to burn 36.1 g of B2H6?
B2H6 = 27.68 g/mol
13.8 g O2
3.91 mol of O2
125 g O2
41.7 g O2
- 10. Multiple Choice
18.26 mL of a 1.50 mol/L hydrochloric acid reacts with magnesium hydroxide. Calculate the mass of magnesium hydroxide needed for the reaction.
Mg(OH)2 + 2 HCl -> 2 H2O + MgCl2
Mg(OH)2 = 58.33 g/mol ; HCl = 36.46 g/mol
4.68 g Mg(OH)2
0.799 g Mg(OH)2
0.0274 Mg(OH)2
1.60 g Mg(OH)2
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