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How many moles of water, H2O, contain 2.0×1022 molecules of water? (See the hints for assistance in interpreting scientific notation.)

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 Avogadro Number of molecules is contained in 1 mole of water 

6.02 * 10²³ molecules are contained in 1 mole of water.

2 * 10²² molecules will contain:           (1* 2 * 10²²) / (6.02 * 10²³)
 
                                                         ≈ 0.0332 mole of Water.

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