10.8 moles are present in 6.5 × 10²⁴ atoms of Barium (Ba). Details on how to calculate number of moles can be found below.
The number of moles of a substance can be calculated by dividing the number of atoms in the substance by Avogadro's number.
According to this question, 6.5 × 10²⁴ atoms of Ba are present, the number of moles is calculated thus:
no of moles = 6.5 × 10²⁴ ÷ 6.02 × 10²³
no of moles = 1.08 × 10¹
no of moles = 10.8moles
Therefore, 10.8 moles are present in 6.5 × 10²⁴ atoms of Barium (Ba).
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