NaOH (Sodium Hydroxide) Molar Mass

NaOH (Sodium Hydroxide) Molar Mass

Find the Molar Mass of Sodium Hydroxide, NaOH Step-by-Step

There are 4 easy steps to find the molar mass of NaOH based on its chemical formula.

1. Count The Number of Each Atom

The first step to finding the molar mass of Sodium Hydroxide is to count the number of each atom present in a single molecule using the chemical formula, NaOH:
ElementNumber of Atoms
Na (Sodium)1
O (Oxygen)1
H (Hydrogen)1

2. Find Atomic Mass of Each Element

Next, using the periodic table, find the atomic mass in g/mol of each element (the molar mass of an element is equal to its atomic mass):
Molar Mass (g/mol)
Na (Sodium)22.98976928
O (Oxygen)15.9994
H (Hydrogen)1.00794

3. Compute Mass of Each Element

Multiply the number of atoms by the atomic weight of each element found in steps 1 and 2 to get the mass of each element in NaOH:
Molar Mass (g/mol)
Na (Sodium)1 × 22.98976928 = 22.98976928
O (Oxygen)1 × 15.9994 = 15.9994
H (Hydrogen)1 × 1.00794 = 1.00794

4. Sum Each Element's Mass

Finally, add together the total mass of each element to get the molar mass of NaOH:
22.98976928 g/mol + 15.9994 g/mol + 1.00794 g/mol = 39.99710928 g/mol

5. Find Mole Fraction

To find the mole fraction and percentage of each element in NaOH, divide each total from step 3 by the total molar mass found in step 4:
Mole FractionPercent
Na (Sodium)22.98976928 ÷ 39.99710928 = 0.574786× 100 = 57.4786%
O (Oxygen)15.9994 ÷ 39.99710928 = 0.400014× 100 = 40.0014%
H (Hydrogen)1.00794 ÷ 39.99710928 = 0.0252× 100 = 2.52%

Molecular Weight of NaOH

39.9971 g/mol

The molar mass and molecular weight of NaOH is 39.997.
Edit Elemental Percent Composition

Convert NaOH From Moles to Grams

Moles mol

Convert NaOH From Grams to Moles and Molecules

Weight g

Composition of Sodium Hydroxide - NaOH

Element Symbol Atomic Mass # of Atoms Mass Percent
Sodium Na 22.9898 g/mol 1 57.4786%
Oxygen O 15.9994 g/mol 1 40.0014%
Hydrogen H 1.0079 g/mol 1 2.52%
Sodium Hydroxide Element Mass PercentSodium22.9898gSodium22.9898gOxygen15.9994gOxygen15.9994gHydrogen1.0079gHydrogen1.0079g NaOH # of AtomsSodium1Sodium1Oxygen1Oxygen1Hydrogen1Hydrogen1

Instructions

This program determines the molecular mass of a substance. Enter the molecular formula of the substance. It will calculate the total mass along with the elemental composition and mass of each element in the compound.

  • Use uppercase for the first character in the element and lowercase for the second character. Examples: Fe, Au, Co, Br, C, O, N, F.
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Examples

Finding Molar Mass

Read our article on how to calculate molar mass.

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