Input
Uses NA = 6.02214076×1023 mol-1.
mol/L
Result
Results History
| # | Timestamp | Mode | MW (g/mol) | Inputs | Output |
|---|
Add your computed result, then export as CSV or PDF.
Formula Used
- Moles → Grams:
g = MW × n - Molecules → Grams:
g = (MW × N) / NA, withNA = 6.02214076×1023 - Grams → Moles:
n = g / MW - Solution:
g = MW × M × V(L)
All masses reported in grams. Unit choices are normalized internally.
How to Use
- Enter the molecular weight of the substance in g/mol.
- Choose a calculation mode to match your data.
- Provide the required input values and select units where applicable.
- Set preferred decimal places, then click Compute.
- Review the result and optionally add it to the history.
- Export your history or example table to CSV, or export a PDF.
For solutions, convert volume to liters and multiply by molarity.
Example Data
| Compound | Formula | MW (g/mol) | Amount | Result (g) |
|---|---|---|---|---|
| Water | H2O | 18.01528 | 2 mol | 36.03056 |
| Sodium chloride | NaCl | 58.44 | 0.75 mol | 43.83 |
| Glucose | C6H12O6 | 180.156 | 0.10 mol | 18.0156 |
These examples use g = MW × n with given moles.
Quick Reference: Common Molecular Weights
| Substance | Formula | MW (g/mol) | 1 mol → g | 0.10 mol → g |
|---|---|---|---|---|
| Water | H2O | 18.01528 | 18.01528 | 1.801528 |
| Ethanol | C2H6O | 46.06844 | 46.06844 | 4.606844 |
| Sodium chloride | NaCl | 58.44 | 58.44 | 5.844 |
| Glucose | C6H12O6 | 180.156 | 180.156 | 18.0156 |
| Acetone | C3H6O | 58.08 | 58.08 | 5.808 |
| Calcium carbonate | CaCO3 | 100.0869 | 100.0869 | 10.00869 |
| Sulfuric acid | H2SO4 | 98.079 | 98.079 | 9.8079 |
| Sodium bicarbonate | NaHCO3 | 84.0066 | 84.0066 | 8.40066 |
| Acetic acid | C2H4O2 | 60.052 | 60.052 | 6.0052 |
| Ammonia | NH3 | 17.0305 | 17.0305 | 1.70305 |
Use these as starting points; always confirm compound-specific values.
Conversions & Constants Used
| Quantity | Symbol | Value | Notes |
|---|---|---|---|
| Avogadro constant | NA | 6.02214076×1023 mol-1 | Exact by definition (SI). |
| Milli | m- | 10-3 | mmol → mol; mg → g. |
| Micro | µ- | 10-6 | µmol → mol; µg → g. |
| 1 kilogram | kg | 1000 g | Mass to grams. |
| 1 milligram | mg | 0.001 g | Mass to grams. |
| 1 micogram | µg | 0.000001 g | Mass to grams. |
| 1 milliliter | mL | 0.001 L | Volume to liters. |
| 1 mole | mol | MW grams | g = MW × 1. |
These factors are applied automatically inside the calculator.
Worked Examples: Molecular Weight → Grams
| Scenario | Inputs | Calculation | Result |
|---|---|---|---|
| Moles → Grams | Glucose, MW 180.156; n = 0.25 mol | g = 180.156 × 0.25 | 45.039 g |
| Molecules → Grams | Water, MW 18.01528; N = 3.0×1021 | g = (18.01528 × 3.0×1021) / 6.02214076×1023 | 0.089745 g |
| Solution (M×V) → Grams | Glucose, MW 180.156; M = 0.20 mol/L; V = 100 mL | g = 180.156 × 0.20 × 0.100 | 3.60312 g |
| Grams → Moles | NaCl, MW 58.44; m = 250 mg | n = 0.250 g / 58.44 | 0.0042779 mol |
Cross-check with your own inputs to validate workflow and rounding.