Enter your First Compound (A) and Second Compound (B) alongside their moles and stoichiometric coefficients, and the Molar Ratio Calculator gives you the Molar Ratio (A:B), a Simplified Ratio, the Theoretical Stoichiometric Ratio, and an Excess/Deficiency Analysis to show which reactant you've got too much — or not enough — of.
Molar Ratio (A:B)
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Simplified Ratio
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Theoretical Stoichiometric Ratio
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Excess/Deficiency Analysis
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A molar ratio is the ratio between the number of moles of any two compounds in a chemical reaction. It represents the stoichiometric relationship between reactants and products based on the balanced chemical equation.
To calculate molar ratio, divide the number of moles of one compound by the number of moles of another compound. The formula is A:B = moles of A / moles of B. This gives you the proportional relationship between the substances.
The actual molar ratio is calculated from experimental data using the actual moles present. The theoretical molar ratio comes from the balanced chemical equation's stoichiometric coefficients. Comparing these helps identify limiting reagents.
By comparing the actual molar ratio to the theoretical ratio from the balanced equation, you can determine which reactant will be consumed first. The limiting reagent determines the maximum amount of product that can be formed.
Yes, molar ratios can be simplified to their lowest whole number terms, just like fractions. For example, a ratio of 6:2 simplifies to 3:1, making it easier to understand the relationship between compounds.
To convert grams to moles, divide the mass in grams by the molar mass (molecular weight) of the compound. The formula is: moles = mass (g) / molar mass (g/mol). Use this before calculating molar ratios.
Molar ratios are crucial for predicting reaction outcomes, calculating yields, determining limiting reagents, and scaling reactions up or down. They ensure you use the correct proportions of reactants for complete reactions.