question_answer

     Compute the difference in masses of one mole each of aluminium atoms and one mole of its ions. (Mass of an electron is 9.1 X 10-28 g). Which one is heavier?   

Answer:

                  Mass of 1 mole of aluminium atom = Molar mass of aluminium = 27 g mol-1. An aluminium atom needs to lose three electrons to become an ion, . For one mole ofion, three moles of electrons are to be lost. The mass of three moles of electrons Molar mass of                                     = 26.9984 g Difference = 27 - 26.9984                       = 0.0016 g