Question

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Answer 1

Explanation:

6.023*10^23 oxygen atoms =1 mole of oxygen atoms 1 oxygen atoms = 1/6.023*10^23 mole of oxygen atoms 2.58*1024 oxygen atoms =2.58*10^24/6.023*10^23 mole of oxygen atoms = 0.428*10

= 4.28

Answer 2

Given number of O₂ molecules in sample=2.58×10²⁴.

 As we know that, 1 molecule =6.022×10²³ oxygen atoms

          2.58×10²⁴O₂ atoms=2.58×10²⁴/6.022×10²³

                                               ⇒4.28 moles.