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Percent Composition — result sheet
Molar mass and element mass percents from a formula.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: mass% = element mass / total molar mass × 100.
Each element contributes count times atomic weight. Percents are each share of the molar-mass total.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Chemical formula — Symbols like H2O or Ca(OH)2; one-level parentheses only.
Worked example
| Input | Value |
|---|---|
| Chemical formula | H2O |
Molar mass 18.015 g/mol; H 11.19%, O 88.81%.
Assumptions and limits
- Standard atomic weights; pure compound.
- One-level parentheses with integer counts.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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