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Question

0.5 moles of water molecules.


Solution

For 1 mole of water =molecular mass of water (H2O)in grams                       =mass of 2H  atoms +mass of O atoms                             =2×1+16     
=2+16        
                               =18 grams ⇒ for 1 mole

For 0.5 moles = 18×0.5
                          = 9.0 grams

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