Chemistry Calculator Stoichiometry With Steps

Stoichiometry Calculator with Steps

Use this free stoichiometry calculator to solve mole-to-mole, gram-to-mole, mole-to-gram, and gram-to-gram chemistry problems using balanced chemical equation ratios.

Calculate Stoichiometry

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How Stoichiometry Works

Stoichiometry uses the coefficients from a balanced chemical equation to compare substances in a reaction. The coefficients create the mole ratio.

Moles wanted = Moles given × coefficient wanted ÷ coefficient given

For gram-based problems, first convert grams to moles, use the mole ratio, then convert moles back to grams if needed.

Worked Example

For the equation 2H₂ + O₂ → 2H₂O, how many moles of O₂ are needed to react with 4 mol of H₂?

mol O₂ = 4 mol H₂ × 1 ÷ 2 = 2 mol O₂

The answer is 2 mol of O₂.

Practice Question

For the equation 2H₂ + O₂ → 2H₂O, how many moles of H₂O are produced from 3 mol of O₂?