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2015-10-24T15:56:30+05:30

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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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2015-10-24T16:06:08+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
1 mole of H2O= molecular mass of H20 in grams
                           =mass of 2Hatoms +mass of O atoms
                         =2*1+16
                           =18g
now,1 mole of  H2O=18g
so, mass of 0.5 mole of H2O=18*0.5
                                                      =9grams
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