determine the number of moles in 4.50g of MgCl2?
Formula mass magnesium chloride: 95.21 grams/mole check that.
moles=4.50/95.21
To determine the number of moles in 4.50g of MgCl2, we need to use the molar mass of MgCl2.
The molar mass of MgCl2 can be calculated by adding up the atomic masses of magnesium (Mg) and chlorine (Cl).
- The atomic mass of magnesium (Mg) is approximately 24.31 g/mol.
- The atomic mass of chlorine (Cl) is approximately 35.45 g/mol.
To find the molar mass of MgCl2, we multiply the atomic mass of magnesium by 1 (since there is one Mg atom) and the atomic mass of chlorine by 2 (since there are two Cl atoms in MgCl2). Then we add these values together.
Molar mass of MgCl2 = (24.31 g/mol × 1) + (35.45 g/mol × 2) = 95.21 g/mol
Now, we can calculate the number of moles in 4.50g of MgCl2 using the formula:
Number of moles = Mass of substance / Molar mass
Number of moles = 4.50g / 95.21 g/mol ≈ 0.047 moles
Therefore, there are approximately 0.047 moles of MgCl2 in 4.50g of MgCl2.