Question

Calculate the number of moles of magnesium present in a magnesium ribbon weighing 12 g. Molar atomic wight of magnesium is 24 g/mole.

URGENT!!!

Answer 1

we know that,
No. of moles = $\frac{Given mass}{Molar mass}$
So,
No. of moles =$\frac{12 g}{24 g}$
                   =$\frac{1}{2}$ moles

Answer 2

The number of moles of magnesium present in a magnesium ribbon weighing 12 g is 0.5 mole.

Solution:

Since Molar atomic weight of the magnesium is given, 24 $\frac{g}{mole}$.

The given mass of the magnesium ribbon is 12 g.

The number of moles can be calculated as,

$\begin{array}{l}{=\frac{\text { mass }}{\text { molar mass }}}\\ \\ {=\frac{12}{24}} \\\\ {=\frac{1}{2}=0.5}\end{array}$

Hence, the number of moles will be 0.5 mole.

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