Question

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


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Answer 1

Explanation:

Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur. ∴ 16 g of sulphur = 16 256 1 16 = moles = 0.125 moles 1 mole of S8 molecules = 6.023 × 1023 number of molecules ∴ 1 16 mole of S8 = 6.023 × 1023 number of molecules × 1 16 .

Answer 2

no. of molecules = 0.376 x 10^23

no. of molecules = no. of moles x Na

so, no. of moles

= given mass /molar mass =

= 16/256 = 1/16

Now,

no. of molecules = 1/16 x Na= 0.376 x 10^23Hence,

no. of molecules

= 0.376 x 10^23

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