R-2 Stoichiometry

Question 1

N₂(g) + 3 H₂(g) → 2NH₃(g) Fill in the blank:

For every 1 mole of nitrogen gas consumed with excess hydrogen gas, _____ moles of ammonia gas are produced

Answer 1

2 moles of ammonia

Question 2

N₂(g) + 3 H₂(g) → 2NH₃(g) Fill in the blank:

For every 2 moles of nitrogen gas consumed with excess hydrogen gas, _____ moles of ammonia gas are produced

Answer 2

4 moles of ammonia

Question 3

N₂(g) + 3 H₂(g) → 2NH₃(g) Fill in the blank:

For every 0.5 mole of nitrogen gas consumed with excess hydrogen gas, _____ mole(s) of ammonia gas are produced

Answer 3

1 mole of ammonia

Question 4

N₂(g) + 3 H₂(g) → 2NH₃(g) Fill in the blank:

For every 1 mole of nitrogen gas consumed _____ mole(s) of hydrogen gas are also consumed.

Answer 4

3 mole of hydrogen gas

Question 5

N₂(g) + 3 H₂(g) → 2NH₃(g) Fill in the blank:

For every 2 mole of nitrogen gas are consumed _____ mole(s) of hydrogen gas are also consumed.

Answer 5

6 mole of hydrogen gas

Question 6

N₂(g) + 3 H₂(g) → 2NH₃(g) Fill in the blank:

For every 0.5 moles of nitrogen gas are consumed _____ mole(s) of hydrogen gas are also consumed.

Answer 6

1.5 mole of hydrogen gas

Question 7

N₂(g) + 3 H₂(g) → 2NH₃(g) Fill in the blank:

When 2 moles of ammonia are created, _____ moles of hydrogen gas must be consumed

Answer 7

3 mole of hydrogen gas

Question 8

N₂(g) + 3 H₂(g) → 2NH₃(g) Fill in the blank:

When 4 moles of ammonia are created, _____ moles of hydrogen gas must be consumed

Answer 8

6 moles of hydrogen gas

Question 9

N₂(g) + 3 H₂(g) → 2NH₃(g) Fill in the blank:

When 1 moles of ammonia are created, _____ moles of hydrogen gas must be consumed

Answer 9

1.5 moles of hydrogen gas

Question 10

N₂(g) + 3 H₂(g) → 2NH₃(g)

1 mole of nitrogen gas is combined with 1 mole of hydrogen gas. What is the limiting reagenet?

Answer 10

hydrogen gas

Question 11

N₂(g) + 3 H₂(g) → 2NH₃(g)

3 moles of nitrogen gas are combined with 1 mole of hydrogen gas. What is the limiting reagenet?

Answer 11

hydrogen gas

Question 12

N₂(g) + 3 H₂(g) → 2NH₃(g)

1 moles of nitrogen gas is combined with 4 moles of hydrogen gas. What is the limiting reagenet?

Answer 12

nitrogen gas

Question 13

N₂(g) + 3 H₂(g) → 2NH₃(g)

10 moles of nitrogen gas are combined with 31 moles of hydrogen gas. What is the reagent in excess?

Answer 13

hydrogen gas

Question 14

True/False

The limiting reagent is always the reactant present in lesser amounts.

Answer 14

False

Question 15

True/False

The limiting reagent is always the reactant with the smaller coeeffcient in the balanced reaction equation

Answer 15

False

Question 16

CH₄ + 2 O₂ → CO₂ + 2 H₂O

Based on the following model, what is the limiting reagent

Answer 16

O₂

Question 17

CH₄ + 2 O₂ → CO₂ + 2 H₂O

Based on the following model, what is the limiting reagent

Answer 17

O₂

Question 18

Why is oxygen present in both the before and the after sides of the following diagram?

Answer 18

It is the reagent in excess. The hydrogen runs out.

Question 19

The following diagram describes what is left over after the reaction of carbon monoxide with hydrogen to form methanol. What should be in the before box? CO + 2 H₂ → CH₃OH

Answer 19

1 CO molecule and 4 H₂ molecules

Question 20

Nitrogen atoms are purple and hydrogen atoms are clear. Write out the balanced chemical equation represented by the following model.

Answer 20

N₂ + 3 H₂ → 2NH₃

You need to reduce to lowest form and cancel like terms on each side of the equation

Question 21

Carbon atoms are grey, hydrogen atoms are clear, and oxygen atoms are red. Write out the balanced chemical equation represented by the following model.

Answer 21

CH₄ + 2 O₂ → CO₂ + 2 H₂O

You need to reduce to lowest form and cancel like terms on each side of the equation

Question 22

The point durring a titration when both reactants have been perfectly used up.

Answer 22

Equivalence point

Question 23

The point during a titration when the indicator changes to let you know to stop the titration.

Answer 23

End point

Question 24

The equivalence point and end point are the same thing in a titration. (True or False)

Answer 24

False. We try to set up a system where they are the same but the end point typically lags the equivalence point but some fraction of a drop.

Question 25

Based on the following reaction model. is this reaction at the equivalence point? How can you tell?

Answer 25

Yes. Both reactants have been consumed. There is no reagent in excess.