Question

find the number of o atom in 90 gm of h20????????
plzz ans ..............fast

Answer 1

number of moles in water = 90/18=5 number of atoms=5*6.022×10^23×3 = 90.33×10^23 atoms of water

Answer 2

number of moles in water = 90/18
                                            =5 number of atoms
                                            =5 × 6.022 × 10^23 × 3
           [ since water contains two hydrogen atom and one oxygen atom]
                                           = 90.33×10^23 atoms of water.