Molarity is defined as the number of moles of solute dissolved in 1 L of solution. The mass of CuSO₄ - 400 g molar mass of CuSO₄ - 159.5 g/mol Therefore number of CuSO₄ moles - 400 g/ 159.5 g/mol = 2.51 mol the volume of the solution is - 4.00 L We need to find the number of moles in 1.00 L If 4.00 L contains - 2.51 mol Number of moles in 1.00 L - 2.51 mol / 4.00 L = 0.628 mol Molarity - 0.628 M