Chemical Quantities Unit Review

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

How many molecules are in 2.5 mol of CO₂?

• 1.51x10²³

• 146

• 4.15

• 1.51x10²⁴

How many moles of H₂ are needed to react with 2 moles of N₂ according to the reaction?

1 N₂ + 3 H₂ → 2 NH₃

• 6

• 2

• 3

• 1

What is the first thing you must do to determine the limiting reactant

• Make sure the chemical reaction is Balanced

• Panic

• Divide by Avogadro's Number

• Multiple by Avogadro's Number

How many moles of H₂O can be produced if 8 moles of H₂ are reacted according to the following reaction?

2 H₂ + 1 O₂ → 2 H₂O

• 4 moles

• 8 moles

• 16 moles

• 2 moles

If 12.00 moles of NaClO₃ react, how many moles of O₂ will be produced according to the reaction?

2 NaClO₃ → 2 NaCl + 3 O₂

• 12 moles of O₂

• 18 moles of O₂

• 9 moles of O₂

• 6 moles of O₂

How many grams are in 7.8 moles of NaCl?

• 476grams
• 460 grams
• 452 grams
• 462 grams

P₄ + 3O₂ --> P₄O₆  What is the limiting reactant if 8 moles of P₄ react with 6 moles of O₂?

• P₄
• O₂
• P₄O₆ 
• none of the above

Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.

• 1.16%
• 116%
• 85%
• 76%

What is the limiting reactant if 10 moles of NH₃  react  with 30.0 moles of NO?
4NH₃+6NO --> 5N₂ + 6H₂O

• NH₃
• NO
• N₂
• water