Chapter 3: Atoms and Molecules

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Atoms and Molecules


Q.10: Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur.


The gram atomic mass of sulphur is 32g.

Molar mass of S8 = 8(Atomic mass of S)

= 8 (32g) = 256g

This means that 1 mole of S8 weighs 256g. So, the mass of 6.023x1023 molecules of S8 is 256g.

So, the number of molecules in 16g of S8

mathbf{=frac { 6.023	imes { 10 }^{ 23 } }{ 256g } 	imes 16g=3.76	imes { 10 }^{ 22 } molecules}


Therefore, the correct answer is 3.76x1022 molecules.

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