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Question 10

Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur.

Answer

Molar mass of S8 = 8 x 32 = 256 g

           256 g = 6.022 x 1023 no. of molecules of S8

No. of molecules present in 16 g of solid sulphur = 6.022x1023 / 256 x 16 = 0.376 x 1023

          = 3.76x1022

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