Q 10.     Calculate the number of molecules of sulphur (S8 ) present in 16 g of solid sulphur.

Answers (1)

Given the mass of Sulphur = 16 g

The molecular mass of the Sulphur molecule = 8 x 32 = 256 g.

The number of moles of Sulphur molecule :

=\frac{16}{256}

=0.0625\:moles

Now 

Number of molecules in 1 mole = 6.022\times 10^{23} molecules

So,

The number of molecules in 0.0625 moles = 0.0625\times6.022\times 10^{23} molecules.

                                                                    =  3.76375\times 10^{22} Molecules.

Hence there are 3.76375\times 10^{22} Sulphur molecules in  16 g of solid sulphur.

 

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