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

Answer:

Let us calculate the mass of one mole of aluminium atom

Al – 3e → Al+3(3 moles of electrons)

Mass of three moles of electrons = (3 × 9.1×10-28) × 6.023 x 1023

Mass of three moles of electrons = 0.001644 g

Molar mass of Al3+ = 27 – 0.001644

Molar mass of Al3+ = 26.99 gmol-1

Difference in mass = 27 – 26.9984

Difference in mass = 0.0016 g

1 mole of Al atoms is heavier than 1 mole of Al3+ions.

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