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The number of moles of magnesium present in a magnesium ribbon weighing 12g will be: (The molar atomic mass of magnesium is 24g $mo l^{- 1}$ .)

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1 mol

0.5 mol

1.5 mol

1.2 mol

answer is C.

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Detailed Solution

The number of moles of magnesium present in a magnesium ribbon weighing 12g will be 0.5 mol.
Given that
The Molar mass of Mg

= 24 g mo l^{- 1}

Given the mass of Mg

= 12 g

Number of moles of Mg

= \frac{given mass}{molar mass}

= \frac{12 g}{24 g mo l^{- 1}}

= 0.5 mol

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