If you click on the elements in order, the molecular weight that is summed by adding the atomic weight is displayed.
For example, if you want to know the molecular weight of water (H2O), click H twice, then click O once.
Molecular weight calculator
Molecular weight is the relative mass of a molecule based on its carbon-12 atoms (6 protons + 6 neutrons).
If the mass (g) unit is added after the molecular weight number, it becomes the mass value of the substance corresponding to 1 mole of the molecule.
mole : a unit for counting the number of particles
Because atoms are tiny, you cannot count the number of atoms and molecules one by one. For example, about 1,400,000,000,000,000,000,000 water molecules are contained in a raindrop with a diameter of 1 mm.
In this case, it is easy to bundle several particles and calculate them as a single unit. The most used unit is 'mole.'
1 mole is defined as the number of carbon-12 atoms in 12 grams of mass. This number is called the Avogadro number and is about 6.0221415×1023.