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Molar Mass Calculator

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Molar mass is the mass of one mole of an element or a compound that is expressed in g/mol. Molar mass of the compound is the sum of the molar masses of each atoms in a molecule of the given compound. Molar mass is the product of atomic mass of each element and the number of atoms of the element present in compound. If you plug in the compound into the calculator, the molar mass calculator will find the molar mass of the given compound.

One mole = number of atoms in 12g of Carbon-12 = $6.022 \times 10^{23}$.
 

Steps

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Step 1 : Put down the given data and check the atomic mass from the periodic table and note down.

Step 2 : Multiply the atomic mass of each element with the number of atoms of the element.

Step 3 : Add all the molar mass of each element and get the molar mass of the given compound.

Problems

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Here are some of the problems related to sample size given below.

Solved Examples

Question 1: Determine the molar mass of $Na_{2}CO_{3}$.
Solution:
 
Determine the molar mass of $Na_{2}CO_{3}$.
Given compound = $Na_{2}CO_{3}$

From the periodic table,
Atomic mass of Na = 23.0 g/mol
Atomic mass of C = 12.0 g/mol
Atomic mass of O = 16.0 g/mol

Molar mass of Na = 2 $\times$ 23.0 g/mol = 46.0 g/mol
Molar mass of C = 1 $\times$ 12.0 g/mol = 12.0 g/mol
Molar mass of O = 3 $\times$ 16.0 g/mol = 48.0 g/mol

Molar mass of $Na_{2}CO_{3}$ = 46.0 g/mol + 12.0 g/mol + 48.0 g/mol
Molar mass of $Na_{2}CO_{3}$  = 106.0 g/mol
 

Question 2: Determine the molar mass of $Ca(OH)_{2}$.
Solution:
 
Determine the molar mass of $Ca(OH)_{2}$.
Given compound = $Ca(OH)_{2}$

From the periodic table,
Atomic mass of Ca = 40.1 g/mol
Atomic mass of O = 16.0 g/mol
Atomic mass of H = 1.0 g/mol

Molar mass of Ca = 1 $\times$ 40.1 g/mol = 40.1 g/mol
Molar mass of O = 2 $\times$ 16.0 g/mol = 32.0 g/mol
Molar mass of H = 2 $\times$ 1.0 g/mol = 2.0 g/mol

Molar mass of $Ca(OH)_{2}$ = 40.1 g/mol + 32.0 g/mol + 2.0 g/mol
Molar mass of $Ca(OH)_{2}$ = 74.1 g/mol