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Question

Calculate the number of atoms in 48 g of Mg.

A
12.04×1023
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B
6.02×1023
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C
18.06×1023
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D
24.08×1023
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Solution

The correct option is D 12.04×1023
Atomic mass of magnessium (Mg) is 24
Moles of Mg=4824=2
Number of atoms of Mg = Moles×Avogadro number = 2×6.023×1023=12.04×1023
Option A is correct.

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