Calculate the weight of $0.8$ moles of magnesium.

20 g

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19.2 g

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30 g

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31.2 g

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Solution

The correct option is B $19.2 g$
given that $0.8$ moles of Mg
molecular weight of Mg $= 24 g / m o l$
Moles $= \frac{g r a m w e i g h t o f M g}{M o l e c u l a r w e i g h t o f M g}$
$0.8 = \frac{W e i g h t o f M g}{24}$
Weight of Mg $= 19.2 g$

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