There are 1.240 x 10^23 atoms in 32.8 grams of Cu2S.
We first calculate the number of moles
Number of moles =Mass/ Molar mass
Molar mass of Cu2S= 63.546 X 2 + 32.065=159.157 g/mol
Number of moles = 32.8 grams/159.157 g/mol=0.206 moles
Now, 1 mole = 6.022 × 10^23 Avogadro's Number for atoms, molecules, etc.
0.206 moles=0.206 moles x 6.022 × 10^23 atoms
=1.240 x 10^23 atoms.
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