To calculate the number of moles of magnesium used in the experiment, use the formula: moles = mass / molar mass.
The formula involves dividing the mass of magnesium (in grams) by its molar mass (in grams per mole). The molar mass of magnesium is approximately 24.31 g/mol. So, if you have the mass of magnesium sample, plug it into the formula:
moles = mass of magnesium/molar mass of mmagnesium
For instance, if you have 10 grams of magnesium, the calculation would be:
moles = 10 g/24.31 per mol
moles ≈ 0.411mol
Therefore, to determine the moles of magnesium used, apply the formula: (moles = mass / molar mass), with the experimental mass of magnesium and its molar mass, resulting in the number of moles for the given sample.