The number of molecules in a mol of a substance is the Avogadro number: 6,022 140 857 (74).10e23.
The amount of chemical energy a substance has is determined by the types and arrangement of atoms and molecules in that substance. The energy is stored within the chemical bonds between these atoms and molecules. The strength of these bonds and the potential energy stored in them determine the amount of chemical energy.
The average amount of energy in the motion of the molecules of a substance is the temperature of that substance. Heat is simply random motion on a sub-microscopic scale.
Temperature is not a measure of the amount of heat stored in a substance. It is the measure of the kinetic energy of the molecules of a substance.
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You can find molecules on every surface of the world because molecules are the smallest particle of a substance.