Molecular Weight Reiknivél (Formula to Molar Mass and Elemental Composition)

Q: "Does it support parentheses and hydrates?"

"Yes. It supports common parentheses, bracketed groups, and hydrate notation such as CuSO4·5H2O. Because ASCII '.' can look like either a decimal point or a hydrate separator, the verkfæri shows a warning and the interpretation it used."

Q: "Which atomic weights does it use?"

"The niðurstaða always shows the selected atomic weight tafla and its version. A shareable URL preserves the calculation settings, including the tafla used."

Q: "Is molecular weight different from molar mass here?"

"In this verkfæri they are treated as the same numerical value and displayed with both g/mol and Da labels."

Q: "Can I use it for reaction equations?"

"This verkfæri is focused on formula-based molar mass and composition. For reaction coefficients, limiting reagent checks, or yield calculations, use the stoichiometry reiknivél."

Q: "Can I specify isotopes?"

"Yes. Turn on isotope notation in Settings to use inntaks such as [13]C. By default the verkfæri uses representative atomic weights."

Calculate molar mass and elemental composition by mass from a chemical formula such as C6H12O6.

Supports parentheses and hydrates such as CuSO4·5H2O, and warns instead of silently guessing when notation is ambiguous.

Show g/mol and Da together

Supports parentheses, brackets, and hydrates

Reuse with copy, CSV, and shareable URLs

How to use

Enter a chemical formula or choose one of the example chips.
Adjust significant digits, atomic weight tafla, or ASCII '.' handling if needed.
Run the calculation to see molar mass, interpreted formula, and elemental composition by mass.
Reuse the niðurstaða with copy, CSV export, or a shareable URL.

Sample

Glucose

Inntak C6H12O6

Úttak Molar mass 180.156 g/mol and mass % for C, H, and O

Copper(II) sulfate pentahydrate

Inntak CuSO4·5H2O

Úttak Molar mass, interpreted formula CuSO4 + 5H2O, and elemental composition

Ambiguous ASCII dot

Inntak CuSO4.5H2O

Úttak Shows a warning and the interpretation used for this run

Glossary

Molecular weight

The sum of the atomic masses in a chemical formula.

Molar mass

The mass per mole of a substance. This verkfæri displays it in g/mol.

Elemental composition

The fraction of the total mass contributed by each element, expressed as mass percent.

Hydrate

A compound that contains water of crystallization, written like CuSO4·5H2O.

Formulas

Total mass = Σ(count of each species × atomic weight used)
Mass % = contribution mass ÷ total mass × 100

Athugasemdir

Charge notation does not affect mass and is ignored in the calculation.
ASCII '.' is ambiguous, so use '·' for hydrates whenever possible.
Reaction balancing and stoichiometric yield calculations are outside the scope of this verkfæri.

Algengar spurningar

Does it support parentheses and hydrates?

Yes. It supports common parentheses, bracketed groups, and hydrate notation such as CuSO4·5H2O. Because ASCII '.' can look like either a decimal point or a hydrate separator, the verkfæri shows a warning and the interpretation it used.

Which atomic weights does it use?

The niðurstaða always shows the selected atomic weight tafla and its version. A shareable URL preserves the calculation settings, including the tafla used.

Is molecular weight different from molar mass here?

In this verkfæri they are treated as the same numerical value and displayed with both g/mol and Da labels.

Can I use it for reaction equations?

This verkfæri is focused on formula-based molar mass and composition. For reaction coefficients, limiting reagent checks, or yield calculations, use the stoichiometry reiknivél.

Can I specify isotopes?

Yes. Turn on isotope notation in Settings to use inntaks such as [13]C. By default the verkfæri uses representative atomic weights.