Calculator Inputs
Example Data Table
| Compound | Mass (g) | Molar Mass (g/mol) | Purity (%) | Moles |
|---|---|---|---|---|
| Sodium Chloride (NaCl) | 5.00 | 58.44 | 100 | 0.08556 |
| Sulfuric Acid (H2SO4) | 9.80 | 98.079 | 100 | 0.09992 |
| Calcium Carbonate (CaCO3) | 25.00 | 100.0869 | 100 | 0.24978 |
| Glucose (C6H12O6) | 18.00 | 180.156 | 100 | 0.09991 |
Formula Used
Mass conversion: mass in grams = entered mass × unit factor
Pure mass: pure mass = mass in grams × (purity ÷ 100)
Moles: moles = pure mass ÷ molar mass
Millimoles: millimoles = moles × 1000
Molecules: molecules = moles × 6.02214076 × 1023
Molarity: molarity = moles ÷ solution volume in liters
Stoichiometric target moles: target moles = reactant moles × (target coefficient ÷ reactant coefficient)
These relationships let you move from weighed sample mass to reaction scale, concentration, particle count, and theoretical yield planning.
How to Use This Calculator
- Choose a preset compound or switch to a custom compound.
- Enter the measured sample mass and its unit.
- Set purity to account for assay grade, moisture, or impurities.
- Add solution volume only when you need molarity.
- Enter reaction coefficients for stoichiometric scaling.
- Add a target molar mass when estimating product mass.
- Pick significant figures that match your lab reporting style.
- Submit the form to view results above the calculator.
Frequently Asked Questions
1. What does this calculator convert?
It converts a measured sample mass into moles using molar mass. It also shows purity-adjusted mass, millimoles, micromoles, molecules, optional molarity, and stoichiometric equivalents for reaction planning.
2. Why does purity affect the answer?
Impure material contains less active compound than the total weighed sample. The calculator corrects the entered mass so mole calculations use only the chemically relevant portion.
3. Can I use milligrams or kilograms?
Yes. The tool accepts grams, milligrams, kilograms, micrograms, pounds, and ounces. It converts everything to grams before applying the mole formula.
4. What is molar mass?
Molar mass is the mass of one mole of a substance, expressed in grams per mole. It links laboratory mass measurements to particle counts and reaction quantities.
5. What if my compound is not listed?
Choose the custom option and enter your own compound name, formula, and molar mass. This is useful for hydrates, mixtures, rare salts, isotopic materials, or research-specific substances.
6. When should I enter solution volume?
Enter solution volume only when you want molarity. The calculator converts the volume to liters, then divides moles by that volume to report concentration.
7. How do the coefficients work?
They apply the mole ratio from a balanced equation. A 2:1 ratio means two moles of reactant correspond to one mole of the target species.
8. Can this estimate theoretical product mass?
Yes. Add the target compound’s molar mass and the balanced-equation coefficients. The calculator converts reactant moles into target moles, then into theoretical product mass.