yield and excess

yield and excess

Multiple Choice

P₄ + 6Cl₂ --> 4PCl₃ 
The reaction of 75.0g P₄ with excess chlorine gas produces 110g PCl₃ in lab. Find the theoretical yield and calculate percent yield for the reaction. 

• 78%
• 64%
• 27%
• 33%

Multiple Choice

4NH₃ + 5O₂ --> 4NO + 6H₂O

what is the theoretical yield of NO if 6.30g of ammonia react with 1.80g of oxygen?

• 0.37g

• 0.045g

• 1.35g

• 11.1g

Multiple Choice

P₄ + 3O₂ --> P₄O₆

what is the left over amount when 12 moles of P₄ react with 15 moles of O₂?

• 12 mol

• 7 mol

• 5 mol

• none of the above

Multiple Choice

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

• 1.16%
• 116%
• 85%
• 76%

Multiple Choice

Use the equation 2 Al + 3 Cl₂ ---> 2 AlCl₃.  If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.

• AlCl3
• Cl2
• Al

Multiple Choice

The limiting reactant

• slows the reaction down
• is used up first
• is the reactant that is left over
• controls the speed of the reaction