Question

calculate the number of molecules of sulphur s8 present in 16 g of solid sulphur

Answer 1

No. of molecules =
No. of moles × Avogadro's no. =
Given mass ÷ Molar mass × Avogadro's no.=
16/16×8 × 6.022 × 10²³=
1/8 × 6.022 × 10²³= 7.25 × 10²²

Answer 2

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To calculate molecular mass of sulphur:

Molecular mass of Sulphur (S8)

= 8xMass of Sulphur = 8×32 = 256g

Mass given = 16g

Number of moles = mass given/ molar mass of sulphur

= 16/256 = 0.0625 moles

To calculate the number of molecules of sulphur in 16g of solid sulphur:

Number of molecules = Number of moles X Avogadro number

= 0.0625 x 6.022 x 10²³ molecules

= 3.763 x 10²² molecules

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