Question 1

In the reaction

2H_{2} + O_{2} \rightarrow 2H_{2}O

, if you have

4.0

moles of

H_{2}

and

1.5

moles of

O_{2}

, which is the limiting reactant?

Accepted Answer

Oxygen (O2)

Answer

Neither, they are in stoichiometric proportions

Answer

Hydrogen (H2)

Answer

Water (H2O)

Question 2

Which of the following best defines a "Limiting Reactant" in a chemical reaction?

Accepted Answer

The reactant that is completely consumed first and determines the maximum amount of product formed.

Answer

The reactant that has the lowest molar mass in the reaction.

Answer

The reactant that has the smallest coefficient in the balanced chemical equation.

Answer

The reactant that remains in excess after the reaction has gone to completion.

Question 3

In the reaction

2H_{2} + O_{2} \rightarrow 2H_{2}O

, if you combine

4.0

moles of Iron (Fe) and

H_{2}

moles of Oxygen (

1.5

), which substance is the limiting reactant?

Accepted Answer

Iron (Fe)

Answer

Iron(III) oxide (Fe2O3)

Answer

Neither, they are in stoichiometric proportions

Answer

Oxygen (O2)

Question 4

In the reaction

2H_{2} + O_{2} \rightarrow 2H_{2}O

, if you start with

4.0

moles of

H_{2}

and

1.5

moles of

O_{2}

, which is the limiting reactant?

Accepted Answer

Hydrogen (H2)

Answer

Water (H2O)

Answer

Neither, they are in stoichiometric proportions

Answer

Oxygen (O2)

Question 5

If

2H_{2} + O_{2} \rightarrow 2H_{2}O

grams of aluminum (

4.0

, molar mass

H_{2}

g/mol) reacts with

1.5

grams of chlorine gas (

O_{2}

, molar mass

70.9

g/mol) to form aluminum chloride via the equation

2Al + 3Cl_{2} \rightarrow 2AlCl_{3}

, which substance is the limiting reactant?

Accepted Answer

Chlorine (Cl2)

Answer

Aluminum chloride (AlCl3)

Answer

Aluminum (Al)

Answer

There is no limiting reactant

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