Question 1

How do I balance a chemical equation?

Accepted Answer

Adjust coefficients so atoms of each element are equal on both sides; the calculator can suggest minimal integer coefficients.

Question 2

What is a limiting reagent?

Accepted Answer

The reactant that runs out first; it limits how much product can form in the reaction.

Question 3

How do I convert grams to moles?

Accepted Answer

Use moles = mass (g) / molar mass (g/mol); get molar mass from the chemical formula.

Question 4

How do percent yield and theoretical yield differ?

Accepted Answer

Theoretical yield is the maximum possible; percent yield = actual/theoretical x 100%.

Question 5

Do I need molar masses for hydrates and ions?

Accepted Answer

Yes—include waters of hydration and ionic charges do not affect molar mass.

Stoichiometry Calculator