Reactions with a limiting reactant

Please note: You can only check your solution for the stoichiometry of the reaction equation if all coefficients have been defined explicitely. Although a coefficient of "1" is normally not stated it needs to be actively selected for the check-function to work properly.


Exercise 2a
Exercise 2b
Exercise 2c

Reaction equations and stoichiometry 2a

How much (which mass) of manganese dioxide (MnO₂) can be obtained if the given amounts of the other substances are available? First balance the reaction equation; coefficients with the value 1 also need to be stated explicitely.

Reaction equation: Mn + O₂ → MnO₂
MnO₂MnO₂
Mass (g)
Molar mass (g/mol)
Amount of substance (mol)
limiting reactant (mol)

Reaction equations and stoichiometry 2b

How much (which mass) of potassium fluoride (KF) can be obtained if the given amounts of the other substances are available? First balance the reaction equation; coefficients with the value 1 also need to be stated explicitely.

Reaction equation: K + F₂ → KF
KF₂KF
Mass (g)
Molar mass (g/mol)
Amount of substance (mol)
limiting reactant (mol)

Reaction equations and stoichiometry 2c

Calculate how much (which mass) aluminium sulfate (Al₂(SO₄)₃) can be obtained, if 17.50 g Al react with 78.50 g H₂SO₄. First balance the reaction equation; coefficients with the value 1 also need to be stated explicitely.

Reaction equation: Al + H₂SO₄ → Al₂(SO₄)₃ + H₂
AlH₂SO₄Al₂(SO₄)₃H₂
Mass (g)
Molar mass (g/mol)
Amount of substance (mol)
limiting reactant (mol)