How to use the empirical formula ratio calculator
Find mole ratio of two elements from mass data. Enter mass of element 1, molar mass of element 1, mass of element 2, molar mass of element 2 in the fields above; the moles of element 1, moles of element 2, ratio element 2 : element 1 are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- m1 — Mass of element 1 (g)
- M1 — Molar mass of element 1 (g/mol)
- m2 — Mass of element 2 (g)
- M2 — Molar mass of element 2 (g/mol)
Worked example
With mass of element 1 = 40.0 g, molar mass of element 1 = 12.011 g/mol, mass of element 2 = 6.7 g, molar mass of element 2 = 1.008 g/mol, the calculator gives moles of element 1 ≈ 3.330281 mol; moles of element 2 ≈ 6.646825 mol; ratio element 2 : element 1 ≈ 1.995875.
Frequently asked questions
What is the formula for the empirical formula ratio calculation?
Moles of element 1 (mol) = m1 / M1. Moles of element 2 (mol) = m2 / M2. Ratio element 2 : element 1 = [Moles of element 2] / [Moles of element 1]. Here m1 is mass of element 1 (g), M1 is molar mass of element 1 (g/mol), m2 is mass of element 2 (g), M2 is molar mass of element 2 (g/mol).
What inputs do I need for the empirical formula ratio calculator?
You need mass of element 1 in g, molar mass of element 1 in g/mol, mass of element 2 in g, molar mass of element 2 in g/mol. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.