Question

claculate the diffrence in masses of one mole each of aluminum atoms and one mole of its ions. which one is heavier ( 9.1 X 10^-31kg). Which one is heavier?

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Answer 1

Answer:

0.0016 g

Explanation:

• Mass of 1 mole of aluminium atom = the molar mass of aluminium = 27 g mol–1

An aluminium atom needs to lose three electrons to become an ion,

• Al3+ For one mole of A13+ ion,

three moles of electrons are to be lost.

• The mass of three moles of electrons = 3 × (9.1×10–28 ) × 6.022×1023 g

• 27.3 × 6.022 ×10–5 g = 164.400 ×10–5 g = 0.00164 g Molar mass of Al3+ = (27–0.00164) g mol–1 = 26.9984 g mol–1
• Difference = 27 – 26.9984 = 0.0016 g

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