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1)O
2)O2. 16×2=32. 6.022×10^23 molecules of Oxygen
3)Na. 23. 6.022×10^23 atoms of Na
4)Na+ , 23. 6.022×10^23 ions of Na+
5)NaCl. 23+35.5=58.5.
6)H2O. 1×2+16=18
6.022×10^23 units of H2O
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