Question

How many atoms and molecules of sulphur are present in 64g of sulphur (S8)

Answer 1

Molar mass of sulphur (S8) = 8 x 32 = 256 g /mol

∴ No. of moles of S8 = 64 / 256 = 0.25

∴ No. of molecules = 0.25 x 6.022 x 10^23

= 1.50 x 10^23molecules

∴ No. of S-atoms = 1.50 x 10^23 x 8

= 1.20 x 10^23 atoms

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Answer 2

Answer-

mole = 64/32

= 2

now

2 × 6.022 × 10^23

= 12 × 10^23

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