The periodic table is a very helpful tool for finding the molar masses of different chemical compounds. This is important when working with stoichiometry, which is all about measuring substances in reactions.

Each element on the periodic table has a number called the atomic mass. This number tells us the average mass of an atom of that element, which is shown in atomic mass units (amu).

Steps to Calculate Molar Mass:

1. Identify the Elements: Look at the compound and figure out what elements are there.

2. Find Atomic Masses: Use the periodic table to find the atomic mass of each element. Here are a few examples:

   • Carbon (C): about 12.01 amu
   • Hydrogen (H): about 1.008 amu
   • Oxygen (O): about 16.00 amu

3. Multiply by the Number of Atoms: For each element, multiply its atomic mass by how many atoms of that element are in the compound. For example, in water (H₂O):

   • For Hydrogen (H): 2 atoms × 1.008 amu = 2.016 amu
   • For Oxygen (O): 1 atom × 16.00 amu = 16.00 amu

4. Add the Total Masses: Add all the individual masses together to find the molar mass of the compound.

   • So, the molar mass of H₂O = 2.016 amu + 16.00 amu = 18.016 amu

By following these steps, chemists can measure and analyze reactions and solutions. This makes the periodic table a crucial tool in understanding stoichiometry.