Final answer:
The molarity of magnesium ions in 2 liters of water is 1 M, calculated by converting 48.6 g of Mg to moles and dividing by the volume in liters.
Step-by-step explanation:
To calculate the molarity of magnesium (Mg) ions in 2 L of H2O, you first need the molar mass of magnesium. The molar mass of magnesium is 24.305 g/mol. Using this information:
- Convert the mass of magnesium to moles: 48.6 g ÷ 24.305 g/mol = 2 moles of Mg.
- Since molarity is moles of solute per liter of solution, divide the moles of magnesium by the volume of the solution in liters: 2 moles ÷ 2 L = 1 M.
The molarity of magnesium ions is 1 M (molar).