question_answer 66)

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

Answer:

  Ionizations of Al atom occurs as Therefore, ion is formed from Al atom by loss of 3 electrons. Difference in mass of mole atoms and 1 mole of ions = mass of 3 x 6.022 x 1023 electrons (as mass of an electron ) mole of Al atoms is heavier than 1 mole of  ions. It is because 1 mole of Al atom have  electrons and 1 mole of Al ion have e- = 10 x 6.022 x 1023 electrons