How do you calculate the number of moles and atoms of magnesium given the number o grams of magnesium chloride?
You would have done better to post the problem. It's harder to explain in words and not numbers.
mols MgCl2 = grams MgCl2/molar mass MgCl2.
Then there is 1 mol Mg atoms in 1 mol MgCl2. That is, the number of mols Mg atoms will be the same as the mols MgCl2.
To calculate the number of moles and atoms of magnesium, you'll need the molar mass of magnesium chloride and the given mass of magnesium chloride.
Here's how you can calculate it step by step:
1. Find the molar mass of magnesium chloride (MgCl2).
Magnesium (Mg) has an atomic mass of 24.3050 g/mol, and chlorine (Cl) has an atomic mass of 35.453 g/mol. Since there are two chlorine atoms in magnesium chloride, you multiply the atomic mass of chlorine by 2.
Molar mass of MgCl2 = (1 x Mg) + (2 x Cl)
= (1 x 24.3050 g/mol) + (2 x 35.453 g/mol)
= 24.3050 g/mol + 70.906 g/mol
= 95.2110 g/mol
2. Determine the number of moles of magnesium chloride.
Using the equation:
Number of moles = Mass / Molar mass
Assuming you have the mass of magnesium chloride, divide the mass by the molar mass to calculate the moles.
Number of moles = Mass of magnesium chloride / Molar mass of magnesium chloride
For example, if you have 10 grams of magnesium chloride,
Number of moles = 10 g / 95.2110 g/mol
≈ 0.105 moles
3. Determine the number of atoms of magnesium.
Since there is only one magnesium atom in magnesium chloride, the number of atoms of magnesium will be the same as the number of moles.
Therefore, the number of atoms of magnesium = 0.105 moles
Keep in mind that these are approximate values and may vary slightly due to the accuracy of atomic masses.