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A quantity of aluminium has a mass of 54g. What is the mass of same number of magnesium atoms?

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97.2g

24.3g

48.6g

12.1g

answer is C.

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Detailed Solution

Mass of Magnesium Containing Same Number of Atoms as 54g Aluminium

Moles of Al in 54 g = 54/27 = 2 moles
Number of Al atoms = 2 × Avogadro's number (N)
Moles of Mg required = 2 (since one mole Mg = 24g, two moles = 48g)

Mass of Mg containing same number of atoms as 54 g Al = 48 g

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