The Molar Mass of NAOH – Calculation and Interpretation

Determining the molar mass of a compound is an essential step in various scientific applications, including chemistry, physics, and biology. 

Understanding Molar Mass

Molar mass refers to the mass of one mole of a substance and is expressed in grams per mole (g/mol). It is calculated by summing up the atomic masses of all the atoms present in the compound. The atomic mass is determined by the sum of the protons and neutrons in an atom’s nucleus.

Gathering the Atomic Masses

To calculate the molar mass of NaOH, we need to determine the atomic masses of its constituent elements: sodium (Na), oxygen (O), and hydrogen (H). We can obtain these values from the periodic table of elements:

– Sodium (Na): Atomic mass = 22.99 g/mol

– Oxygen (O): Atomic mass = 16.00 g/mol

– Hydrogen (H): Atomic mass = 1.01 g/mol

Identifying the Subscripts

In the chemical formula of NaOH, the subscript numbers represent the number of atoms of each element in a single molecule. In this case, the subscript for sodium (Na) is 1, oxygen (O) is also 1, and hydrogen (H) is 1. The absence of a subscript is considered 1 by default.

Calculating the Molar Mass

Now that we have the atomic masses and subscript numbers, we can calculate the molar mass of NaOH using the following formula:

Molar Mass of NaOH = (Atomic Mass of Na) + (Atomic Mass of O) + (Atomic Mass of H)

Substituting the values, we have:

Molar Mass of NaOH = (22.99 g/mol) + (16.00 g/mol) + (1.01 g/mol)

Molar Mass of NaOH = 40.00 g/mol

Therefore, the molar mass of NaOH is 40.00 g/mol.

Interpreting the Result

The molar mass of NaOH is 40.00 g/mol. This means that one mole of sodium hydroxide has a mass of 40.00 grams. It is important to note that molar mass is a crucial value in stoichiometric calculations, as it allows us to relate mass to the number of moles and vice versa.

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