How can the periodic table be used to determine molar mass?
The molar mass of a substance is the substance's mass divided by its amount. The amount of a substance is usually set at 1 mole and it's the substance's mass needs to be calculated to find out the molar mass.
The elements that compose a substance all have an atomic mass. The substance's mass is the sum of all of those atomic masses. The periodic table provides the atomic mass next to or below each element.
Find the molar mass of
Molar mass of
We find the atomic mass of Hydrogen and Oxygen in the periodic table. They are
1.007 g/mole for Hydrogen and 15.999 g/mole for Oxygen.
Plug these values into Equation 1 and you'll find the molar mass of water to be around 18g/mole.