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Atomic Number and Mass Number

A quantity of...

Question

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

12.1 g

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24.3 g

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48.6 g

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97.2 g

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Solution

The correct option is B $48.6 g$
Weight of alluminium = 54 g
moles of alluminium = $\frac{54}{27} = 2$
moles of magnesium is also = 2
mass of magnesium ion becomes = $m o l e s * m o l e c u l a r w e i g h t = 2 * 24 = 48 g$

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