The number of atoms in 0.77 mole of Kr is 4.64×10²³ atoms.
From Avogadro's hypothesis,
1 mole of any substance = 6.02×10²³ atoms
Thus,
1 mole of Kr = 6.02×10²³ atoms
With the above information in mind, we can obtain the number of atoms in 0.77 mole of Kr as follow:
1 mole of Kr = 6.02×10²³ atoms
Therefore,
0.77 mole of Kr = 0.77 × 6.02×10²³
0.77 mole of Kr = 4.64×10²³ atoms
Therefore, 0.77 mole of Kr contains 4.64×10²³ atoms.
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