Which one is heavier: 1 mole of aluminium atoms or 1 mole of aluminium ions?

One mole of aluminium atom

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One mole of aluminium ions

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Both have same mass

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Cannot be determined

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Solution

The correct option is A One mole of aluminium atom
$A l^{+ 3}$ has 3 electrons less than $A l$
$∴$ $A l$ is heavier than $A l^{+ 3}$ as an electron has mass.

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