Stoich Review - mixed problems #6

What is a limiting reagent?

• the reactant that determines how much product can be made

• the reactant that is in excess

• the product that you can make the most of

• the amount of reactants that react with each other

If the percentage yield for a chemical reaction performed in the laboratory is 80.0%, the

• actual yield is 80.0g for every theoretical yield of 100g.

• actual yield is 80 times as much as the theoretical yield.

• theoretical yield is 80 times as much as the actual yield.

• theoretical yield is 80.0 g for every actual yield of 100g.

Cl₂ + 2 KBr → Br₂ + 2 KCl

How many grams of potassium chloride can be produced from 356 g of Cl₂ and 356 g of potassium bromide?

• 749 g

• 223 g

• 479 g

• 814 g

C₃H_{8 (g)} + 5O_{2 (g)} → 3CO_{2 (g)} + 4H₂O _(g)

During a reaction, 25 grams of propane are reacted with 100.0 grams of oxygen gas. How many grams of water should be expected from the reaction?

• 45g

• 31g

• 41g

• 52g

6Li + N₂ → 2Li₃N

45.0 grams of lithium are reacted with 120. grams of nitrogen gas. Which of these reactants are the limiting reactant, and how many grams of lithium nitride would be produced?

• Lithium, 250grams Li₃N

• Lithium, 75grams Li₃N

• Nitrogen, 300grams Li₃N

• Nitrogen, 150grams N₂

When reacting Na with Cl₂, we calculated that the theoretical yield should be 13 grams. Our actual yield was 12.5 grams. What is the percent yield?

• 90.4%

• 104%

• 96.15%

• 1.04%

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%

4P + 5O₂ → 2P₄O₁₀

How many grams of tetraphosphorous decoxide would be produced if 125 grams of red phosphorous were allowed to react with an unlimited amount of oxygen gas?

• 1,431g

• 573g

• 72g

• 32g

4P + 5O₂ → 2P₄O₁₀

How many mols of tetraphosphorous decoxide would be produced if 125 grams of red phosphorous were allowed to react with an unlimited amount of oxygen gas?

• 2mols

• 8mols

• 0.5mols

• 10mols

4P + 5O₂ → 2P₄O₁₀

How many grams of tetraphosphorous decoxide would be produced if 4 mols of red phosphorous were allowed to react with an unlimited amount of oxygen gas?

• 1,478g

• 32g

• 239g

• 568g