Calculate mass, molar mass, or moles from the other two values with unit conversions for g, kg, lb, mg, g/mol, kg/mol, and mol, using base units.
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Mass to Moles Formula
The following formula is used to convert mass to moles.
n = m / M
Variables:
- n is the number of moles (mol)
- m is the mass of the substance (grams)
- M is the molar mass of the substance (g/mol)
To convert mass to moles, divide the mass of the substance by its molar mass.
| Mass (g) | Moles (mol) |
|---|---|
| 0.1 | 0.005551 |
| 0.25 | 0.013877 |
| 0.5 | 0.027755 |
| 1 | 0.055509 |
| 2 | 0.111019 |
| 5 | 0.277547 |
| 10 | 0.555093 |
| 12.5 | 0.693866 |
| 15 | 0.832640 |
| 20 | 1.110186 |
| 25 | 1.387733 |
| 50 | 2.775465 |
| 75 | 4.163198 |
| 100 | 5.550930 |
| 150 | 8.326395 |
| 200 | 11.101860 |
| 250 | 13.877325 |
| 500 | 27.754650 |
| 750 | 41.631975 |
| 1000 | 55.509300 |
| *Assumes substance is water with molar mass M = 18.015 g/mol. Formula: n = m / M. | |
What is Molar Mass?
Molar mass is the mass of one mole of a substance and is expressed in grams per mole (g/mol). It is equivalent to the molecular weight of a substance, where each atomic mass unit (amu) is equal to 1 g/mol. The molar mass is used to convert between the mass of a substance and the amount in moles, which is a fundamental concept in chemistry for stoichiometric calculations.
How to Calculate Moles from Mass?
The following steps outline how to calculate the number of moles from mass.
- First, determine the mass of the substance (m) in grams.
- Next, determine the molar mass of the substance (M) in grams per mole.
- Use the formula from above = n = m / M.
- Finally, calculate the number of moles (n).
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
mass of the substance (m) = 50 grams
molar mass of the substance (M) = 18.015 g/mol (water)