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# Calculate the number of molecules of sulphur (S$$_8$$) is present in 16g of solid sulphur.

Molecular mass of Sulphur (S$$_8$$)
= 8 × Mass of Sulphur = 8 × 32 = 256g

Given mass of solid sulphur = 16g

$$Number \ of \ moles$$ = $$Given \ mass \over Molar \ mass \ of \ Sulphur$$ = $$16 \over 256$$ = 0.0625 moles

Number of molecules

= Number of moles × Avogadro number

$$= 0.0625 × 6.022 × 10^{23}$$

$$= 3.763 × 10^{22}$$ molecules