# Molar Mass Lookup

Look up the molar mass (atomic weight) of several elements at once by symbol, atomic number, or name, as a sortable comparison table.

> Canonical page: https://elysiatools.com/en/tools/molar-mass-lookup

- **Category:** Math & Numbers

- **Keywords:** molar mass, atomic weight, element, periodic table, lookup, reference, chemistry

## Overview

The Molar Mass Lookup tool allows you to quickly retrieve and compare the atomic weights and molar masses of multiple chemical elements simultaneously. By entering element symbols, atomic numbers, or names, you can generate a sortable comparison table complete with optional detailed properties like electronegativity, state, and density.

## Inputs

- **Elements (symbols or atomic numbers)** (textarea): Each token may be an element symbol (Fe), an atomic number (26), or an English element name (iron). Separators: comma, space, semicolon, or new line.
- **Sort By** (select)
- **Include full element details** (checkbox): When on, each row also carries category, standard state, electronegativity, melting/boiling point, density, etc.
- **Decimal Places** (number)

## When to use

- When preparing chemical solutions and needing to calculate the molar masses of multiple constituent elements quickly.
- When studying periodic trends and comparing physical properties like electronegativity or melting points across different elements.
- When verifying atomic weights for stoichiometry calculations using a customizable decimal precision.

## How it works

- Input one or more elements using their chemical symbols, atomic numbers, or English names, separated by commas, spaces, or newlines.
- Choose your sorting preference, such as input order, atomic number, atomic weight, or alphabetical order.
- Toggle the option to include full element details and set your preferred decimal precision for the atomic weights.
- Submit the query to generate a structured JSON output containing the calculated molar masses and element metadata.

## Use cases

- Generating a quick reference table of transition metals for laboratory formulation calculations.
- Comparing electronegativity and density values across a specific group of elements for academic research.
- Batch-retrieving atomic weights with high decimal precision for precise stoichiometric calculations.

## Frequently asked questions

### What input formats does the tool support for identifying elements?

You can enter chemical symbols (e.g., Fe), atomic numbers (e.g., 26), or English element names (e.g., iron).

### Can I look up multiple elements at the same time?

Yes, you can input multiple elements separated by commas, spaces, semicolons, or newlines to compare them in a single query.

### What additional element details can be included in the output?

Enabling full details includes properties such as chemical category, standard state, electronegativity, melting/boiling points, and density.

### How can I sort the resulting element table?

You can sort the results by your original input order, atomic number, atomic weight (ascending), or alphabetically by symbol.

### Can I customize the precision of the atomic weights?

Yes, you can adjust the decimal places option to display values with up to 8 decimal places of precision.

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