Calculate moles from a mass in kilograms using a chemical formula or molar mass, or solve for mass or molar mass, with purity and particle count.

Specify the chemical entity. Formula molar masses are approximate for normal isotopic composition; use manual molar mass for isotope-specific material.

Whole-number formulas; · or * for hydrates. Periods only for .5H2O-style hydrates, never decimals. Charges/isotope labels are unsupported.

Purity and display

Blank means 100%. Mass percentage of the exact formula, including hydrate water.

kg To Moles Formula

The following formula is used to calculate the amount of substance in moles from its mass in kilograms.

Moles = Mass (grams) / Molar Mass (g / mol)

Variables:

  • Moles is the amount of substance (moles)
  • Mass is sample mass, initially in kilograms and converted to grams; for an impure sample, use the target substance’s mass percentage
  • Molar Mass is the mass of one mole of the substance (in g/mol)

To calculate the amount of substance in moles, first convert the mass of the substance from kilograms to grams. Then, divide the mass in grams by the molar mass of the substance. The result is the amount of substance in moles.

Kilograms to Moles Conversion Table (Water, M = 18.015 g/mol)
Mass (kg) Molar Mass (g/mol) Moles (mol)
0.0118.0150.555
0.02518.0151.388
0.0518.0152.775
0.07518.0154.163
0.1018.0155.551
0.2018.01511.102
0.2518.01513.877
0.3018.01516.653
0.4018.01522.204
0.5018.01527.755
0.7518.01541.632
118.01555.509
1.2518.01569.387
1.5018.01583.264
1.7518.01597.141
218.015111.019
2.518.015138.773
318.015166.528
3.518.015194.283
418.015222.037
* Rounded to 3 decimals. Uses n = m/M with mass converted to grams (1 kg = 1000 g). Assumes water: M = 18.015 g/mol → 1 kg ≈ 55.509 mol.

What is kg To Moles?

kg to Moles is a conversion process used in chemistry to convert the mass of a substance (measured in kilograms) to the amount of substance (measured in moles). This is done using the substance’s molar mass, which is the mass of one mole of that substance. The molar mass is usually given in grams per mole (g/mol), so the mass in kilograms must first be converted to grams. The formula used is: moles = mass (in grams) / molar mass (in g/mol).

How to Calculate kg To Moles?

The following steps outline how to calculate the kg To Moles using the formula: Moles = Mass (in grams) / Molar Mass (in g/mol).

  1. First, determine the mass of the substance (in kilograms).
  2. Next, convert the mass from kilograms to grams by multiplying it by 1000.
  3. Next, determine the molar mass of the substance (in g/mol).
  4. Finally, calculate the moles by dividing the mass (in grams) by the molar mass (in g/mol).
  5. 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 (in kilograms) = 2

Molar Mass (in g/mol) = 32 (manually supplied); for a pure sample, moles = 2 × 1000 ÷ 32 = 62.5 mol