Question

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

Answer 1

• 1 mole of sulphur =8×1(gram atomic mass of sulphur
• 8×32g=256gram
• 1 mole of S8 molecules =6.022×10²³
• 256gram of S8 molecules=6.022×10²³
• 16 gram of S8 molecules has =6.022×10²³×16/256 molecules
• =3.76×10²² molecules

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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