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PLEASE HELP ME SOLVE!!!!

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Answer:Option C. 0.7x10^2 moles Step-by-step explanation:1mole of a substance contains 6.02x10^23 atoms as discovered from Avogadro's hypothesis.If 1 mole of Ne contains 6.02x10^23 atoms, Therefore, Xmol of Ne will contain 4.2154x10^25 atoms i.eXmol of Ne = (4.2154x10^25)/6.02x10^23 = 70moles = 0.7x10^2 moles

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