Moles and Avogadro’s Numbers

This represents 0.5 mole of water. Half of 18 g equals 9 g.

The balanced equation shows that 1 mole of nitrogen reacts with 3 moles of hydrogen, giving a mole ratio of 1:3.

One mole of propane requires 5 moles of oxygen. Therefore, 2 moles require 10 moles of oxygen.

Every mole contains 6.022 × 10²³ particles regardless of the substance.

Since one mole contains Avogadro's number of atoms, dividing the molar mass by this constant gives the mass of one atom.

Six moles of water are formed from four moles of ammonia. The ratio simplifies to 3:2.