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**Concept:**

The mass of one mole of a substance in grams is called molar mass. It is equal to the sum of the mass of moles of each element present in the substance. The S.I unit of molar mass is.

**Solution:**

The steps to calculate the molar mass of a substance are as follows:

1. Write the chemical formula of the substance.

2. Determine the moles of atoms of each element present in one mole of the substance.

3. Take the sum of the mass of moles of each element present in the substance.

The chemical formula of calcium chloride is,

The elements present in calcium chloride are:

1. Calcium (Ca)

2. Chlorine (Cl)

In one mole of calcium chloride, one mole of calcium atoms and two moles of chlorine atoms are present.

The mass of one mole of calcium atoms is,

The mass of one mole of chlorine atoms is,

The formula to calculate the molar mass of calcium chloride is,

…… (1)

Substitute for and for in equation (1).

Therefore, the molar mass of calcium chloride is .

**Similar problems:**

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**Question:**

** **

**1. What is the molar mass of water?**

**Solution:**

The chemical formula of water is,

The elements present in water are:

1. Hydrogen (H)

2. Oxygen (O)

In one mole of water, two moles of hydrogen atoms and one mole of oxygen atoms are present.

The mass of one mole of hydrogen atoms is,

The mass of one mole of oxygen atoms is,

The formula to calculate the molar mass of water is,

…… (2)

Substitute for and for in equation (2).

Therefore, the molar mass of water is .

**Question:**

**2. What is the molar mass of sodium chloride?**

**Solution:**

The chemical formula of sodium chloride is,

In one mole of sodium chloride, one mole of sodium atoms and one mole of chlorine atoms are present.

The mass of one mole of sodium atoms is,

The mass of one mole of chlorine atoms is,

The formula to calculate the molar mass of sodium chloride is,

…… (3)

Substitute for and for in equation (3).

Therefore, the molar mass of sodium chloride is .

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