Can I mix percent composition and gram inputs in the same run?

Yes. Percent inputs assume a 100 g sample while gram inputs stay as given. The app logs every step: mass → moles → divide by the minimum → integerise with multiplier k and optional GCD reduction.

What happens if the combustion analysis predicts negative oxygen?

If the oxygen-by-difference becomes ≤ 0, the tool raises a warning so you can re-check the measurements or consider other hetero atoms. The multiplier used for integerisation is still recorded.

Which data are included in the CSV and shareable URL?

The CSV contains the selected mode, inputs, each stage (mass, moles, ratios, integers), and the How it's calculated log. Shared URLs preserve the mode, inputs, tolerance, max k, GCD option, ordering, and any custom atomic weights.

Empirical & molecular formula calculator (with steps) — percent composition, combustion analysis, hydrates

Overview

The composition mode walks through mass → moles → ratios → integerisation → empirical formula. Molecular mode checks whether a target molar mass matches the empirical unit within tolerance. Combustion mode converts CO₂ and H₂O masses into CHO ratios, while Hydrate mode estimates xH₂O from mass loss.

Download the whole trail as CSV or grab a shareable URL via Ctrl+S / Ctrl+L. Integerisation tolerance, maximum multiplier k, GCD reduction, Hill ordering, and custom atomic weights help align the tool with lab data or course conventions.

Calculator

Element	Amount	Unit	Actions

Integerisation & atomic weight settings

Results

How it's calculated

FAQ

Can I combine percent and gram data in Composition mode?

Absolutely. Percent inputs are converted using the standard 100 g assumption, while gram inputs stay untouched. Each conversion step is logged so the class can follow the algebra.

What if oxygen from combustion becomes negative?

The app flags a warning and keeps the intermediate ratios so you can revisit the measurements or include other hetero atoms such as N, S, or Cl.

Do share links capture my settings?

Yes. Shared URLs embed tolerance, max k, the GCD toggle, element ordering, and any custom atomic weights, ensuring reproducible results.