As the mass of magnesium is not given, we can look through the example .
To find moles of a substance we need to convert mass to moles. For example, if we have 12 g of Mg:
12gMg×1moleMg24.31gMg=0.49molesMg12 g Mg \times \frac{1mole Mg}{24.31 g Mg}=0.49 moles Mg12gMg×24.31gMg1moleMg=0.49molesMg
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