Stoichiometry

Using the following equation:
Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)
How many moles of iron can be made from  6 moles H₂? 

• 4 moles Fe
• 6 moles Fe
• 9 moles Fe
• 2 moles Fe

2 NaClO₃ (s) --> 2NaCl (s) +3 O₂ (g)

12.00 moles of NaClO₃ will produce how many grams of O₂?

• 256.0 g of O₂

• 576.0 g of O₂

• 288.0 g O₂

2Na + 2H₂O → 2NaOH+ H₂ How many grams of H₂ are produced if 120 g of Na reacts with water?

• 5.2 g

• 2.6 g

• 690 g

• 45 g

2Al + 3H₂SO₄ -> Al₂(SO₄)₃ + 3H₂ How many grams of aluminum sulfate (Al₂(SO₄)₃) would be formed if 250g H₂SO₄ completely reacted with aluminum?

• 0.85 g

• 290 g

• 450 g

• 870 g

N₂ +  3H₂ → 2NH₃ 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 6
• 2
• 3
• 1

B₂H₆ + 3O₂ -->2 HBO₂ + 2 H₂O
 What mass of O₂ will be needed to burn 36.1 g of B₂H₆?

• 13.8 g O₂
• 3.86 mol of O₂
• 124 g O₂

4 Al + 3 O₂ –> 2 Al₂O₃  How many moles of Al would be needed to completely react with 45.0 grams of O₂?

• 1.05 moles
• 3.75 moles
• 1.08 moles

• 1.88 moles

Use the following equation:
NaIO₃ + 6HI --> 3I₂ + NaI + 3H₂O
How many moles of I₂ can be made from 6.55 moles of NaIO₃?

• 4.55 moles I₂
• 23.18 moles I₂
• 19.65 moles I₂
• 34.99 moles I₂

Using the following equation:
4NH₃ + 5O₂ --> 4NO + 6H₂O
How many grams of O₂ are needed to react with 56.8 grams of NH₃?

• 45.1 g O₂

• 133 g O₂

• 261 g O₂

• 75.9 g O₂

2H₂   +   O₂  →  2H₂O
How many moles of water can be produced if 8 moles H₂ are used?

• 4 moles
• 8 moles
• 16 moles
• 2 moles