The molecular formula for eelemental sulphur si $S_{8}$ . In a sample of 5.12 g of slphur:
(a) how many moles of sulphur are present ?
(b) HOw many molecules and atoms are present?

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Solution

(a) molecular mass = 32 $\times$ 8 = 256 g
moles = $\frac{g i v e n m a s s}{m o l e c u l a r m a s s}$ = $\frac{5.12}{256}$ = 0.02

(b) molecules = moles $\times$ $6.02 \times 10^{23}$ = 0.02 $\times$ $6.02 \times 10^{23}$ = 0.1204 $\times 10^{23}$
Atoms in 1 molecule = 8
Total number of atoms = 0.1204 $\times 10^{23} \times 8$ = 0.9632 $\times 10^{23}$

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The molecular formula for eelemental sulphur si S8. In a sample of 5.12 g of slphur: (a) how many moles of sulphur are present ? (b) HOw many molecules and atoms are present?

(a) molecular mass = 32 × 8 = 256 g moles = givenmassmolecularmass = 5.12256 = 0.02 (b) molecules = moles × 6.02×1023 = 0.02 × 6.02×1023 = 0.1204 ×1023 Atoms in 1 molecule = 8 Total number of atoms = 0.1204 ×1023×8 = 0.9632 ×1023

The molecular formula for eelemental sulphur si $S_{8}$ . In a sample of 5.12 g of slphur:
(a) how many moles of sulphur are present ?
(b) HOw many molecules and atoms are present?