Question

find the molarity of water plz reply fast it's urgent

Answer 1

density of water is at 20 C = 0.9982071 gram /ml

let we take 1 liter water 

                                   1 liter = 1000 ml 

            mass of 1 liter water = volume *density  

                                             = 1000 ml * 0.9982071 gram /ml 

                                             =  998.2071 gram


  molar mass of water  H2O = 2* 1.008 + 15.999

                                             = 18.015 gram / moles


number of moles of water in one liter 

                                            = mass of substance / molar mass

                                            = 998.2071 gram/18.015 (gram / moles)

                                            =55.41 moles 


        molarity of water        = number of moles of water / volume of water 

                                           = 55.41 moles/ 1liter 

                                           = 55.41moles/liter

Answer:-  molarity of water at 20 C is 

Answer 2

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Grams have a relationship with moles, via the molar mass of a molecule. We know water molecules 18g/ mole.

{ 16(o) +1(H) +1(H)=18}

we then take 1000g/18g/mole = 5.5555 moles.

So H2O has a molarity of 55.5

Hope it help you☺️......