Molar Ratio Calculator

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Ratio mode gives the simplified ratio. Moles mode converts a known mole quantity. Mass mode converts grams using each substance's molar mass.
The stoichiometric coefficient of substance A in the balanced chemical equation (e.g. the "3" in 3H2).
The stoichiometric coefficient of substance B in the balanced chemical equation (e.g. the "2" in 2NH3).
Molar ratio A : B
1 : 2

Simplified stoichiometric ratio of substance A to substance B

Molar ratio B : A2 : 1
Conversion factor (A to B)2
Moles of B per mol of A2

The molar ratio A : B is 1 : 2.

  • For every 1 mole of substance A that reacts, 2 moles of substance B are involved.
  • The conversion factor is 2.0000: multiply any moles of A by this number to get the equivalent moles of B.
  • B is consumed (or produced) in greater molar quantity than A. For every mole of A, 2.0000 moles of B are required.

Next stepTo confirm limiting reagents, check which reactant is exhausted first by comparing the actual mole ratio to the theoretical molar ratio from the balanced equation.

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