Question

41.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? In of aluminium atom​

Answer 1

Answer:

Mass of 1 mole of aluminium atom = the molar mass of aluminium = 27 g mole −1

An aluminium atom needs to lose three electrons to become an ion Al 3+

For one mole of Al 3+

ion, three moles of electrons will be lost.

Mass of three moles of electrons

=3×(9.1×10 −28 )×6.022×10 23 g

=27.3×6.022×10 23 g

=164.400×10 −5g

=0.00164 g

Molar mass of Al +3

=(27−0.00164)g mol

=26.998g mol

Difference in mass=27–26.9984=0.0016 g