0.25 moles of s8 molecules. (i) Calculate the number of s8 molecules.(ii) calculate the number of s atoms.?

1mol = 6.022x10^23 molecules (Avogadro's number)

(0.25mol S8)(6.022 x 10^23 molecules/mol)

= 1.51 x 10^23 S8 molecules

(1.51 x 10^23 S8 molecules)(8 S atoms / S8 molecule)

= 1.20 x 10^24 S atoms

mol S atoms = 1.20 x 10^24 S atoms / 6.022 x 10^23 atoms/mole

= 2.0mol S atoms

or

mol S atoms = (0.25mol S8 molecules)*(8 S atoms/ S8 molecule)

= 2.0mol S atoms

0.25 moles of S8 molecules x (6.02 x 10^23 S8 molecules / 1 mole S8 molecules) = 1.5 x 10^23 S8 molecules

1.5 x 10^23 S8 molecules x (8 S atoms / 1 S8 molecule) = 1.2 x 10^24 S atoms

0.25 moles S8 molecules x (8 moles S atoms / 1 mole S8 molecules) = 2.0 moles S atoms

0.25 mole of S8 contains Avogadro no./4 molecules and Avogadro no X 2 atoms of sulphur.

1 mol = 6.02 * 10^23 entities

then

1 mol = 6.02 * 10^23 s8 molecules

0.25 -----> x

x= 0.25 * 6.02 * 10^23 = 1.505 * 10^23 s8 molecules

nuumber of s atoms = 8 * x = 12.04 * 10^23

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