The image above represent number of particles in a substance.

To compute for the number of particles in a substance, two essential paramters are needed and these parameters are **Avogadro’s constant (h)** and **number of moles (n). **

The formula for calculating the number of particles in a substance:

Number of particles in a substance = n x Avogadro’s constant

Where;

N = Number of particles in a substance

n = Number of moles

h = Avogadro’s constant

Let’s solve an example:

Find the number of particles in a substance with an Avogadro’s constant of 6.022e+23 and number of moles of 12.

This implies that;

n = Number of moles = 12

h = Avogadro’s constant = 6.022e+23

Number of particles in the substance = 12 x 6.022e+23

Number of particles in the substance = 7.2264e+24

Therefore, the **number of particles in the substance** is **7.2264e+24 particles.**