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The reaction carried out should be:
Mg + 2HCl => MgCl2 + H2
For every mole of Mg, we will have one mole of H2. Therefore, we know that we will also have 2.61 moles of Mg. This is the formula for molar mass:
M = m/n = 64.75 / 2.61 = 24.8
The molar mass of magnesium must then be 24.8 g.
From this, we can conclude that the average magnesium atom has 24.8 protons. According to Wikipedia, the molar mass of magnesium is 24.3 g, which is close to our result.
This investigation could have been performed better in an environment where we could control the pressure more accurately, such as in a pressure chamber...
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