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 explicitly. Although a coefficient of "1" is normally not stated, it needs to be actively selected for the check-function to work properly.


Exercise 1
Exercise 2
Exercise 3

Manganese reacts with oxygen

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 explicitly.

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

Synthesis of potassium fluoride

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 explicitly.

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

Aluminium reacts with sulphuric acid

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 explicitly.

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