How many moles of MgCl2 are in 24.6g of MgCl2?

Answer 1

To calculate between moles and grams, you will need the molar mass of the molecule in question. You can calculate the molar mass of a molecule by adding up the atomic masses of each atom within the molecule. Check a periodic table for the atomic masses.

In this case, the molar mass of MgCl₂ is 95.211 g/mol. We got this by adding the atomic masses of the one Mg atom and two Cl atoms. 24.305 + 2(35.453) = 95.211.

So one mole of MgCl₂ is 95.211 g. We are given 24.6 g.

To find moles, take the mass and divide by the molar mass.

24.6 g x 1 mol/95.211 g = ~0.258 mol.

We have approximately 0.258 mol MgCl₂.