The number of molecules of sulphur present can be determined by using the concept of Avogadro's number and the molar mass of sulphur. Avogadro's number is a fundamental constant in chemistry that represents the number of particles (atoms, molecules, ions, etc.) in one mole of a substance. It is approximately equal to 6.022 x 10^23 particles/mol.

1. Molar mass of sulphur:
The molar mass of sulphur is the mass of one mole of sulphur atoms or molecules. The atomic mass of sulphur is approximately 32 g/mol. Therefore, the molar mass of sulphur is 32 g/mol.

2. Calculating the number of moles of sulphur:
To determine the number of molecules of sulphur, we first need to calculate the number of moles of sulphur present. This can be done using the formula:
Number of moles = Mass of substance / Molar mass

Let's assume we have 16 grams of sulphur:
Number of moles = 16 g / 32 g/mol
Number of moles = 0.5 mol

3. Applying Avogadro's number:
Now that we know the number of moles of sulphur, we can use Avogadro's number to calculate the number of molecules. Since one mole of any substance contains 6.022 x 10^23 particles, we can multiply the number of moles by Avogadro's number to find the number of molecules.

Number of molecules = Number of moles x Avogadro's number
Number of molecules = 0.5 mol x 6.022 x 10^23 particles/mol
Number of molecules = 3.011 x 10^23 molecules

Therefore, if we have 16 grams of sulphur, there will be approximately 3.011 x 10^23 molecules of sulphur present.

In summary, the number of molecules of sulphur present can be determined by dividing the mass of sulphur by its molar mass to find the number of moles, and then multiplying the number of moles by Avogadro's number to find the number of molecules.

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