Question

1. Calculate the number of molecules of sulphur (S8) present in 16g of solid sulphur.
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Answer 1

Given :

• molecules of sulphur (S_8) present in 16g of solid sulphur.

To find :

• Calculate the number of molecules of sulphur (S_8) present in 16g

Solution :

1 mole of S_8 = 32 x 8

= 256 g

1 mole of S_8 = 6.023 x 10²³ molecules

256g S_8 has = 6.023 x 10²³ S_8 molecules

16 g S_8, has = (6.023 x 10²³)/256 x 16

= 3.76 x 10²² molecules.

Answer 2

$\huge\mathfrak\green{answer!}$

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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