Molar Ratio Calculator

Molar Ratio from Moles

Moles of Substance A

Moles of Substance B

Stoichiometric Amount Needed

Moles of Known Substance

Coefficient of Known (in equation)

Coefficient of Unknown (in equation)

Molar Ratio from Masses

Mass of Substance A (g)

Molar Mass of A (g/mol)

Mass of Substance B (g)

Molar Mass of B (g/mol)

Formula

Molar Ratio = n_A / n_B | n_unknown = n_known × (coeff_unknown / coeff_known)

Frequently Asked Questions

What is a molar ratio?

A molar ratio is the ratio of moles of one substance to moles of another in a chemical reaction. It is determined by the coefficients in a balanced chemical equation. For example, in 2H₂ + O₂ → 2H₂O, the molar ratio of H₂ to O₂ is 2:1.

How do I use molar ratios in stoichiometry?

Use molar ratios as conversion factors. Convert given mass to moles, multiply by the molar ratio to find moles of desired substance, then convert back to mass if needed.

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