Question 1

If the theoretical yield of a reaction is 42.0 grams of product and the percent yield is 75%.How many grams were actually produced?

Accepted Answer

The equation for percent yield is:
Percent yield = actual yield/theoretical yield x 100%
We are given the theoretical yield as 42.0 grams of product and the percent yield as 75%. 
Let the actual yield be x grams. 
Using the formula:
75% = x/42.0 x 100%
x = 31.5 grams
Therefore, the answer is C) 32 grams were actually produced.

Question 2

What is the limiting reactant for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH)₂? Reaction: 2HCl + Ca(OH)₂→ 2H₂O+ CaCl₂

Accepted Answer

To determine the limiting reactant, we can use stoichiometry to calculate how much product can be made from each reactant. Using the coefficients in the balanced equation, we can see that for every 2 moles of HCl, 1 mole of Ca(OH)₂ is required. Therefore, if we have 2.6 moles of HCl, we would need 1.3 moles of Ca(OH)₂ in order to react completely. However, we only have 1.4 moles of Ca(OH)₂, which means it is in excess and HCl is the limiting reactant.

Question 3

The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0g.What is the percent yield?

Accepted Answer

The percent yield is calculated by dividing the actual yield by the theoretical yield and then multiplying by 100. So, $ \frac{42.0g}{75.0g} \times 100 = 56.0\%$.

Question 4

How many grams of water are theoretically produced for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH)₂? Reaction: 2HCl + Ca(OH)₂→ 2H₂O+ CaCl₂

Accepted Answer

From the balanced chemical equation, we can see that for every 2 moles of HCl, 1 mole of Ca(OH)₂ is required for the reaction. So, if we have 2.6 moles of HCl, we need 1.3 moles of Ca(OH)₂ to completely react with it. However, we only have 1.4 moles of Ca(OH)₂, which means it will be the limiting reagent. Using the mole ratio from the balanced equation, we know that 1 mole of Ca(OH)₂ produces 1 mole of H2O. Therefore, with 1.4 moles of Ca(OH)₂, we can produce 1.4 moles of H2O. Finally, we can convert moles of water to grams using the molar mass of water: 1.4 moles H2O x 18.015 g/mol = 25.23 g H2O Rounded to 2 significant figures, the answer is 46.8 g of water produced. Therefore, the best choice is C.

Question 5

What is the theoretical yield of waffles if you have 5 cups of flour,9 eggs and 3 tbs of oil?
Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

Accepted Answer

The answer of What is the theoretical yield of waffles...

Question 6

Consider the following generic chemical equation: 2W + 3X → 3Y + Z
When 5 units of W and 6 units of X are allowed to react,the limiting reactant would be:

Accepted Answer

The answer of Consider the following generic chemical equation: 2W...

Question 7

A tricycle factory uses the following items to produce one tricycle: 3 tires,1 frame,and 2 pedals.
If the factory has available 270 tires,90 frames,and 170 pedals,which item would limit the amount of complete tricycles that can be assembled.

Accepted Answer

Since the factory needs 2 pedals for every tricycle, the pedals would be the limiting factor as there are only 170 pedals available. The number of available tires and frames are sufficient to produce at least 90 tricycles (assuming there are no damaged tires or frames).

Question 8

Consider the following generic chemical equation: 2A + 5B → C + 3D
If you react 4 units of A with 10 units of B,which statement is TRUE?

Accepted Answer

Given the stoichiometry of the reaction (2A + 5B → C + 3D), using 4 units of A and 10 units of B matches the exact proportions needed for the reaction to proceed without any excess of reactants. Therefore, there is just enough of A and B for a complete reaction.

Question 9

How many moles of lithium nitrate are theoretically produced if we start with 3.4 moles of Ca(NO₃)₂ and 2.4 moles of Li₃PO₄? Reaction: 3Ca(NO₃)₂+ 2Li₃PO₄→ 6LiNO₃ + Ca₃(PO₄)₂

Accepted Answer

According to the balanced equation, for every 3 moles of Ca(NO₃)₂, we get 6 moles of LiNO₃. Therefore, for 3.4 moles of Ca(NO₃)₂, we get (6/3) x 3.4 = 6.8 moles of LiNO₃. The amount of Li₃PO₄ is not relevant to the calculation of the theoretical yield of LiNO₃.

Question 10

How many moles of calcium chloride are theoretically produced for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH)₂? Reaction: 2HCl + Ca(OH)₂→ 2H₂O+ CaCl₂

Accepted Answer

The answer of How many moles of calcium chloride are...

Question 11

What is the excess reactant for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH)₂? Reaction: 2HCl + Ca(OH)₂→ 2H₂O+ CaCl₂

Accepted Answer

To determine the excess reactant, we need to calculate the amount of each reactant required to fully react with each other. From the balanced equation, we can see that 2 moles of HCl react with 1 mole of Ca(OH)₂. Therefore, the amount of HCl required to react with 1.4 moles of Ca(OH)₂ is (2/1) x 1.4 = 2.8 moles. Since we only have 2.6 moles of HCl, it is the limiting reactant and Ca(OH)₂ is in excess.

Question 12

Determine the theoretical yield of C when 3 units of A and 10 units of B are reacted in the following generic chemical equation: 2A + 5B → 4C.

Accepted Answer

The answer of Determine the theoretical yield of C when...

Question 13

How many grams of NO₂ are theoretically produced if we start with 1.20 moles of S and 9.90 moles of HNO₃? Reaction: S+ 6HNO₃→ H₂SO₄ + 6NO₂ + 2H₂O

Accepted Answer

The answer of How many grams of NO₂ are theoretically...

Question 14

Given the balanced equation CO₂ + Si → SiO₂ + C,if you were to react 1 mole of CO₂ with 1 mole of Si,which statement is TRUE?

Accepted Answer

Given the balanced equation, 1 mole of each reactant reacts completely with the other, indicating equal stoichiometric amounts, making D the correct choice.

Question 15

Which ingredient is the limiting reactant if you have 6 cups of flour,9 eggs and 2 tbs of oil?
Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

Accepted Answer

Oil is the limiting reactant because based on the given recipe, you can only make 2 batches of waffles (8 waffles total) with the 2 tablespoons of oil available, whereas the amounts of flour and eggs are sufficient for 3 and 3 batches, respectively.

Question 16

What is the theoretical yield of waffles if you have 6 cups of flour,9 eggs and 2 tbs of oil?
Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

Accepted Answer

The answer of What is the theoretical yield of waffles...

Question 17

How many grams of calcium phosphate are theoretically produced if we start with 3.40 moles of Ca(NO₃)₂ and 2.40 moles of Li₃PO₄? Reaction: 3Ca(NO₃)₂+ 2Li₃PO₄→ 6LiNO₃ + Ca₃(PO₄)₂

Accepted Answer

The answer of How many grams of calcium phosphate are...

Question 18

What is the limiting reactant for the following reaction given we have 3.4 moles of Ca(NO₃)₂and 2.4 moles of Li₃PO₄? Reaction: 3Ca(NO₃)₂+ 2Li₃PO₄→ 6LiNO₃ + Ca₃(PO₄)₂

Accepted Answer

The stoichiometry of the reaction requires 3 moles of Ca(NO₃)₂ for every 2 moles of Li₃PO₄. Given 3.4 moles of Ca(NO₃)₂ and 2.4 moles of Li₃PO₄, Ca(NO₃)₂ is the limiting reactant because it will be completely consumed first according to the stoichiometric ratio.

Question 19

What is the excess reactant for the following reaction given we have 3.4 moles of Ca(NO₃)₂ and 2.4 moles of Li₃PO₄? Reaction: 3Ca(NO₃)₂+ 2Li₃PO₄→ 6LiNO₃ + Ca₃(PO₄)₂

Accepted Answer

To determine the excess reactant, we need to use the mole ratio of Ca(NO₃)₂ and Li₃PO₄ in the balanced equation. From the equation, we see that 3 moles of Ca(NO₃)₂ react with 2 moles of Li₃PO₄. Therefore, if we have 2.4 moles of Li₃PO₄, but only 1.6 moles (2/3 of 2.4) of Ca(NO₃)₂, then Ca(NO₃)₂ is limiting reactant and Li₃ PO₄ is in excess. Therefore, the excess reactant is Li₃PO₄.

Question 20

What is the theoretical yield of a reaction if 25.0 grams of product were actually produced from a reaction that has a 88% yield?

Accepted Answer

The theoretical yield can be calculated by dividing the actual yield by the percent yield and then multiplying by 100. So, $ \frac{25.0 \, \text{grams}}{0.88} = 28.4 \, \text{grams} $.

Quiz 8: Quantities in Chemical Reactions

If the theoretical yield of a reaction is 42.0 grams of product and the percent yield is 75%.How many grams were actually produced?

What is the limiting reactant for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH) ₂? Reaction: 2HCl + Ca(OH) ₂→ 2H₂O+ CaCl₂

The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0g.What is the percent yield?

How many grams of water are theoretically produced for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH) ₂? Reaction: 2HCl + Ca(OH) ₂→ 2H₂O+ CaCl₂

What is the theoretical yield of waffles if you have 5 cups of flour,9 eggs and 3 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

Consider the following generic chemical equation: 2W + 3X → 3Y + Z When 5 units of W and 6 units of X are allowed to react,the limiting reactant would be:

A tricycle factory uses the following items to produce one tricycle: 3 tires,1 frame,and 2 pedals. If the factory has available 270 tires,90 frames,and 170 pedals,which item would limit the amount of complete tricycles that can be assembled.

Consider the following generic chemical equation: 2A + 5B → C + 3D If you react 4 units of A with 10 units of B,which statement is TRUE?

How many moles of lithium nitrate are theoretically produced if we start with 3.4 moles of Ca(NO₃) ₂ and 2.4 moles of Li₃PO₄? Reaction: 3Ca(NO₃) ₂+ 2Li₃PO₄→ 6LiNO₃ + Ca₃(PO₄) ₂

How many moles of calcium chloride are theoretically produced for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH) ₂? Reaction: 2HCl + Ca(OH) ₂→ 2H₂O+ CaCl₂

What is the excess reactant for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH) ₂? Reaction: 2HCl + Ca(OH) ₂→ 2H₂O+ CaCl₂

Determine the theoretical yield of C when 3 units of A and 10 units of B are reacted in the following generic chemical equation: 2A + 5B → 4C.

How many grams of NO₂ are theoretically produced if we start with 1.20 moles of S and 9.90 moles of HNO₃? Reaction: S+ 6HNO₃→ H₂SO₄ + 6NO₂ + 2H₂O

Given the balanced equation CO₂ + Si → SiO₂ + C,if you were to react 1 mole of CO₂ with 1 mole of Si,which statement is TRUE?

Which ingredient is the limiting reactant if you have 6 cups of flour,9 eggs and 2 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

What is the theoretical yield of waffles if you have 6 cups of flour,9 eggs and 2 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

How many grams of calcium phosphate are theoretically produced if we start with 3.40 moles of Ca(NO₃) ₂ and 2.40 moles of Li₃PO₄? Reaction: 3Ca(NO₃) ₂+ 2Li₃PO₄→ 6LiNO₃ + Ca₃(PO₄) ₂

What is the limiting reactant for the following reaction given we have 3.4 moles of Ca(NO₃) ₂and 2.4 moles of Li₃PO₄? Reaction: 3Ca(NO₃) ₂+ 2Li₃PO₄→ 6LiNO₃ + Ca₃(PO₄) ₂

What is the excess reactant for the following reaction given we have 3.4 moles of Ca(NO₃) ₂ and 2.4 moles of Li₃PO₄? Reaction: 3Ca(NO₃) ₂+ 2Li₃PO₄→ 6LiNO₃ + Ca₃(PO₄) ₂

What is the theoretical yield of a reaction if 25.0 grams of product were actually produced from a reaction that has a 88% yield?

Quiz 8: Quantities in Chemical Reactions

If the theoretical yield of a reaction is 42.0 grams of product and the percent yield is 75%.How many grams were actually produced?

What is the limiting reactant for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH) 2? Reaction: 2HCl + Ca(OH) 2 → 2H2O + CaCl2

The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0g.What is the percent yield?

How many grams of water are theoretically produced for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH) 2? Reaction: 2HCl + Ca(OH) 2 → 2H2O + CaCl2

What is the theoretical yield of waffles if you have 5 cups of flour,9 eggs and 3 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

Consider the following generic chemical equation: 2W + 3X → 3Y + Z When 5 units of W and 6 units of X are allowed to react,the limiting reactant would be:

A tricycle factory uses the following items to produce one tricycle: 3 tires,1 frame,and 2 pedals. If the factory has available 270 tires,90 frames,and 170 pedals,which item would limit the amount of complete tricycles that can be assembled.

Consider the following generic chemical equation: 2A + 5B → C + 3D If you react 4 units of A with 10 units of B,which statement is TRUE?

How many moles of lithium nitrate are theoretically produced if we start with 3.4 moles of Ca(NO3) 2 and 2.4 moles of Li3PO4? Reaction: 3Ca(NO3) 2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4) 2

How many moles of calcium chloride are theoretically produced for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH) 2? Reaction: 2HCl + Ca(OH) 2 → 2H2O + CaCl2

What is the excess reactant for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH) 2? Reaction: 2HCl + Ca(OH) 2 → 2H2O + CaCl2

Determine the theoretical yield of C when 3 units of A and 10 units of B are reacted in the following generic chemical equation: 2A + 5B → 4C.

How many grams of NO2 are theoretically produced if we start with 1.20 moles of S and 9.90 moles of HNO3? Reaction: S + 6HNO3 → H2SO4 + 6NO2 + 2H2O

Given the balanced equation CO2 + Si → SiO2 + C,if you were to react 1 mole of CO2 with 1 mole of Si,which statement is TRUE?

Which ingredient is the limiting reactant if you have 6 cups of flour,9 eggs and 2 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

What is the theoretical yield of waffles if you have 6 cups of flour,9 eggs and 2 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

How many grams of calcium phosphate are theoretically produced if we start with 3.40 moles of Ca(NO3) 2 and 2.40 moles of Li3PO4? Reaction: 3Ca(NO3) 2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4) 2

What is the limiting reactant for the following reaction given we have 3.4 moles of Ca(NO3) 2 and 2.4 moles of Li3PO4? Reaction: 3Ca(NO3) 2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4) 2

What is the excess reactant for the following reaction given we have 3.4 moles of Ca(NO3) 2 and 2.4 moles of Li3PO4? Reaction: 3Ca(NO3) 2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4) 2

What is the theoretical yield of a reaction if 25.0 grams of product were actually produced from a reaction that has a 88% yield?

What is the limiting reactant for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH) ₂? Reaction: 2HCl + Ca(OH) ₂→ 2H₂O+ CaCl₂

How many grams of water are theoretically produced for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH) ₂? Reaction: 2HCl + Ca(OH) ₂→ 2H₂O+ CaCl₂

How many moles of lithium nitrate are theoretically produced if we start with 3.4 moles of Ca(NO₃) ₂ and 2.4 moles of Li₃PO₄? Reaction: 3Ca(NO₃) ₂+ 2Li₃PO₄→ 6LiNO₃ + Ca₃(PO₄) ₂

How many moles of calcium chloride are theoretically produced for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH) ₂? Reaction: 2HCl + Ca(OH) ₂→ 2H₂O+ CaCl₂

What is the excess reactant for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH) ₂? Reaction: 2HCl + Ca(OH) ₂→ 2H₂O+ CaCl₂

How many grams of NO₂ are theoretically produced if we start with 1.20 moles of S and 9.90 moles of HNO₃? Reaction: S+ 6HNO₃→ H₂SO₄ + 6NO₂ + 2H₂O

Given the balanced equation CO₂ + Si → SiO₂ + C,if you were to react 1 mole of CO₂ with 1 mole of Si,which statement is TRUE?

How many grams of calcium phosphate are theoretically produced if we start with 3.40 moles of Ca(NO₃) ₂ and 2.40 moles of Li₃PO₄? Reaction: 3Ca(NO₃) ₂+ 2Li₃PO₄→ 6LiNO₃ + Ca₃(PO₄) ₂

What is the limiting reactant for the following reaction given we have 3.4 moles of Ca(NO₃) ₂and 2.4 moles of Li₃PO₄? Reaction: 3Ca(NO₃) ₂+ 2Li₃PO₄→ 6LiNO₃ + Ca₃(PO₄) ₂

What is the excess reactant for the following reaction given we have 3.4 moles of Ca(NO₃) ₂ and 2.4 moles of Li₃PO₄? Reaction: 3Ca(NO₃) ₂+ 2Li₃PO₄→ 6LiNO₃ + Ca₃(PO₄) ₂