To calculate the **molar mass** of a substance, you need to sum the atomic masses of all the atoms in its chemical formula. Here’s the step-by-step process:

### Steps:
1. **Write the chemical formula** of the compound.
2. **Determine the atomic mass** of each element in the compound from the periodic table. These are usually given in atomic mass units (amu).
3. **Multiply the atomic mass** of each element by the number of atoms of that element in the compound.
4. **Add the results** together to get the total molar mass, expressed in grams per mole (g/mol).

### Example: Calculate the molar mass of H₂O (water)
1. **Chemical formula**: H₂O
2. **Atomic masses** (from the periodic table):
   - Hydrogen (H) ≈ 1.01 g/mol
   - Oxygen (O) ≈ 16.00 g/mol
3. **Multiply by the number of atoms**:
   - For H: 1.01 g/mol × 2 = 2.02 g/mol
   - For O: 16.00 g/mol × 1 = 16.00 g/mol
4. **Add them**:
   - Total molar mass of H₂O = 2.02 g/mol + 16.00 g/mol = 18.02 g/mol

So, the molar mass of water (H₂O) is **18.02 g/mol**.

Would you like further details or have any questions?

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Here are some related questions to expand your understanding:
1. How is molar mass used in stoichiometry?
2. What is the difference between molar mass and molecular mass?
3. How would you calculate the molar mass of a compound with a polyatomic ion?
4. How does the molar mass of isotopes differ from the average atomic mass?
5. How can molar mass help in converting between grams and moles?

**Tip**: Always ensure to account for all atoms in the chemical formula when calculating molar mass!

Learn how to calculate the molar mass of a compound with this step-by-step guide. This tutorial covers key concepts like stoichiometry and atomic mass, using the example of water (H₂O) to demonstrate the calculation. Suitable for students in Grades 9-12.

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