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प्रश्न
Calculate the number of moles of magnesium present in a magnesium ribbon weighing 12 g. Molar atomic mass of magnesium is 24g mol–1.
उत्तर
Atomic mass of Mg = 24 g mol-1
24 g of Mg = 1 mol
12 g of Mg = `12/24`
= 0.5 mol
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