Molecular Formula Calculator
Molecular Formula Calculator
Enter an empirical formula (the simplest whole-number atom ratio) and the compound's known molar mass. This calculator divides the actual molar mass by the empirical formula's own mass to find a whole-number multiplier, then multiplies every subscript in the empirical formula by it to get the true molecular formula.
- The molecular formula is always a whole-number multiple of the empirical formula, e.g. glucose's molecular formula C₆H₁₂O₆ is exactly 6 times its empirical formula CH₂O.
- The multiplier = actual molar mass ÷ empirical formula mass, rounded to the nearest whole number.
- Use the Empirical Formula Calculator first if you only have percent composition data, then bring the result here together with the compound's known molar mass.
How do I find the molecular formula from an empirical formula?
Divide the compound's actual molar mass by the mass of the empirical formula, round to a whole number, and multiply every subscript in the empirical formula by that number.
What is the molecular formula of glucose if its empirical formula is CH2O and molar mass is 180.16 g/mol?
The empirical formula mass of CH2O is about 30.03 g/mol, and 180.16 / 30.03 ≈ 6, so the molecular formula is C₆H₁₂O₆.
Molecular Formula Calculator
Enter an empirical formula (the simplest whole-number atom ratio) and the compound's known molar mass. This calculator divides the actual molar mass by the empirical formula's own mass to find a whole-number multiplier, then multiplies every subscript in the empirical formula by it to get the true molecular formula.
- The molecular formula is always a whole-number multiple of the empirical formula, e.g. glucose's molecular formula C₆H₁₂O₆ is exactly 6 times its empirical formula CH₂O.
- The multiplier = actual molar mass ÷ empirical formula mass, rounded to the nearest whole number.
- Use the Empirical Formula Calculator first if you only have percent composition data, then bring the result here together with the compound's known molar mass.
How do I find the molecular formula from an empirical formula?
Divide the compound's actual molar mass by the mass of the empirical formula, round to a whole number, and multiply every subscript in the empirical formula by that number.
What is the molecular formula of glucose if its empirical formula is CH2O and molar mass is 180.16 g/mol?
The empirical formula mass of CH2O is about 30.03 g/mol, and 180.16 / 30.03 ≈ 6, so the molecular formula is C₆H₁₂O₆.