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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
Therefore, the correct answer is 3.76x1022 molecules.
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