mol to g Converter
To convert mol to g, multiply the value in moles by the molecular weight (g/mol).
How to Convert mol to g
Use this mol to g converter to turn an amount of substance in moles into a mass in grams. Enter the number of moles and the molecular weight of your substance.
The rule is simple: grams = moles × molecular weight (g/mol). The molecular weight tells you how many grams one mole of the substance weighs.
For example, sodium chloride (NaCl) has a molecular weight of about 58.44 g/mol. So 2 mol of NaCl weighs 2 × 58.44 = 116.88 g.
g = mol × MWMultiply the number of moles by the molecular weight (g/mol) to get grams.Conversion Formula
The formula to convert mol to g is:
Where:
- mol = amount in moles
- g = mass in grams
- MW = molecular weight (molar mass) in g/mol
Conversion Table
Common mol to g conversions are shown below. The last column uses sodium chloride (MW 58.44 g/mol) as an example.
| mol | g (formula) | g for sodium chloride |
|---|---|---|
| 0.01 | 0.01 × MW | 0.5844 |
| 0.1 | 0.1 × MW | 5.844 |
| 0.33 | 0.33 × MW | 19.2852 |
| 0.5 | 0.5 × MW | 29.22 |
| 1 | 1 × MW | 58.44 |
| 2.5 | 2.5 × MW | 146.1 |
| 5 | 5 × MW | 292.2 |
| 10 | 10 × MW | 584.4 |
| 33 | 33 × MW | 1,928.52 |
| 50 | 50 × MW | 2,922 |
| 100 | 100 × MW | 5,844 |
| 250 | 250 × MW | 14,610 |
| 500 | 500 × MW | 29,220 |
| 1,000 | 1,000 × MW | 58,440 |
Worked Examples
Here are some common examples of mol to g conversion, using sodium chloride (MW 58.44 g/mol):
- 58.44 g = 1 mol
- 292.2 g = 5 mol
- 1,928.52 g = 33 mol
- 5,844 g = 100 mol
Unit Definitions
What is a mole (mol)?
The mole (mol) is the SI base unit for amount of substance. It counts particles, such as atoms, molecules or ions.
Since 2019, one mole contains exactly 6.02214076 × 1023 particles. This number is the Avogadro constant.
What is a gram (g)?
The gram (g) is a unit of mass. It is one thousandth of a kilogram, the SI base unit of mass.
In the lab, grams are used to weigh out chemicals and to state molar mass in g/mol.
Why Is Molecular Weight Needed?
Moles count particles. Grams measure mass. One particle of each substance has its own mass, so the link between them is the molecular weight (MW), also called molar mass.
MW tells you how many grams one mole of a substance weighs. For example, one mole of water weighs about 18.015 g, while one mole of glucose weighs about 180.16 g.
Therefore, to convert mol to g, you multiply by MW. Both units use the same prefix size, so no extra step is needed.
Uses and Importance of mol and g
Moles tell you how many particles you have. Grams tell you how much to weigh on a balance. This conversion is the everyday bridge between the two.
Weighing reagents
Chemical equations are written in moles, but balances show grams. You convert moles to grams to know how much powder to weigh.
Making solutions
To make 1 liter of a 1 mol/L NaCl solution, you need 1 mol of NaCl, which is about 58.44 g.
Yield calculations
Chemists predict how many moles of product a reaction gives, then convert to grams to compare with what they actually collect.
Frequently Asked Questions (FAQ)
What is the formula for mol to g?
mass (g) = moles (mol) × molecular weight (g/mol).
How many grams are in 1 mol of water?
Water has a molecular weight of about 18.015 g/mol, so 1 mol of water weighs about 18.015 g.
Where do I find the molecular weight?
Add up the atomic weights of all atoms in the formula, or read it from the product label or a chemical database. Atomic weights are published by IUPAC.
Is molecular weight the same as molar mass?
In everyday lab use, yes. Both give the mass of one mole of a substance, in g/mol.
Why do different substances give different answers?
Each type of molecule has a different mass. One mole of a heavy molecule weighs more than one mole of a light one.
Other Related Tools
Accuracy and Scope
The result is only as accurate as the molecular weight you enter. For salts that contain water (hydrates), use the molecular weight of the hydrate form.
Values in the examples use standard atomic weights and are rounded.
Sources