H2O Molar Mass | How to Calculate Molar Mass

How to calculate the H2O molar mass? Here we discussed the easiest method to calculate the molar mass of different compounds. There are many names for molar mass and it tells us the mass of one mole of a given compound. If you look at the periodic table

H2O molar mass periodic table

The atomic masses of each element are given right below the symbol of an element. For example at the top right corner, hydrogen is present and the atomic mass of hydrogen is given below the symbol of hydrogen which is 1.01.

Let’s Find Out the H2O Molar Mass?

Before calculating the H2O molar mass, we need to know the atoms that make water. Water molecules are made up of one oxygen atom and two hydrogen atoms. So we go to the periodic table and find the atomic masses of oxygen and hydrogen. One thing kept in mind is that in a water molecule, there are two hydrogen atoms present so we multiply the atomic mass of hydrogen by 2 and then add it with oxygen atomic mass. In this way, we calculate the molar mass of water.

  • Hydrogen atomic mass = 1.01 u
  • Oxygen atomic mass = 16.00 u

H2O molar mass = 2 (Atomic mass of H) + (Atomic mass of O)

H2O molar mass = 2 (1.01) + (16.00)

H2O molar mass = 2.02 + 16.00

H2O molar mass = 18.02 g/mol

How to calculate the molar mass step by step?

What is the molar mass of H2SO4?

The molar mass of sulfuric acid is 98.08 g/mol. Sulfuric acid contains hydrogen, sulfur, and oxygen elements. The atomic masses of these elements are given below:

  • Hydrogen atomic mass = 1.01 u
  • Sulfur atomic mass = 32.06 u
  • Oxygen atomic mass = 16.00 u

Molar mass of H2SO4 = 2 (Atomic mass of H) + (Atomic mass of S) + 4 (Atomic mass of O)

Molar mass of H2SO4 = 2 (1.01) + (32.06) + 4 (16.00)

Molar mass of H2SO4 = 98.08 g/mol

How do you find the molar mass of NH3?

NH3 is the molecular formula of ammonia. The molecular geometry of NH3 is trigonal pyramidal. It contains nitrogen and hydrogen elements. Look at the atomic masses of nitrogen and hydrogen.

Molar mass of NH3 = (Atomic mass of N) + 3 (Atomic mass of H)

Molar mass of NH3 = (14.01) + 3 (1.01)

Molar mass of NH3 = 17.04 g/mol

What is the molar mass in g mol for glucose sugar C6H12O6?

Glucose molecule
  • Carbon atomic mass = 12.01 u
  • Hydrogen atomic mass = 1.01 u
  • Oxygen atomic mass = 16.00 u

Molar mass of C6H12O6 = 6 (Atomic mass of C) + 12 ( Atomic mass of H) + 6 (Atomic mass of O)

Molar mass of C6H12O6 = 6 (12.01) + 12 (1.01) + 6 (16.00)

Molar mass of C6H12O6 =72.06 + 12.12 + 96

Molar mass of C6H12O6 =180.18 g/mol

How do you find the molar mass of ethanol?

The chemical formula of this compound is CH3CH2OH. Now we calculate the molar mass of ethanol:

  • Carbon atomic mass = 12.01 u
  • Hydrogen atomic mass = 1.01 u
  • Oxygen atomic mass = 16.00 u

Molar mass of CH3CH2OH = (Atomic mass of C) + 3 ( Atomic mass of H) × (Atomic mass of C) + 2 ( Atomic mass of H) × (Atomic mass of O) + ( Atomic mass of H)

Molar mass of CH3CH2OH = (12.01) + 3 (1.01) + (12.01) + 2 (1.01) + (16.00) + (1.01)

Molar mass of CH3CH2OH = 12.01 + 3.03 +12.01 + 2.02 + 16.00 + 1.01

Molar mass of CH3CH2OH = 46.08 g/mol

Test Yourself

  1. Calculate the molar mass of Urea?
  2. Calculate the molar mass of Hydrosulfuric acid?
  3. Calculate the molar mass of Benzene?
  4. Calculate the molar mass of Oxalic acid?
  5. Calculate the molar mass of Calcium hydroxide?

The molar mass of all these above compounds is calculated same as we calculate the H2O molar mass and other compounds.

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