Calculate the molarity of a solution made by dissolving 6.785 g of sodium carbonate into a final solution of 250.0 mL

Sure, here are the steps to calculate the molarity:

1. First, we need to convert the mass of sodium carbonate (Na2CO3) into moles. The molar mass of Na2CO3 is approximately 105.99 g/mol. So, we divide the given mass by the molar mass:

   6.785 g / 105.99 g/mol = 0.064 mol

2. Next, we need to convert the volume of the solution from milliliters to liters, because molarity is defined as moles of solute per liter of solution.

   250.0 mL = 0.250 L

3. Finally, we calculate the molarity by dividing the number of moles of solute by the volume of the solution in liters:

   0.064 mol / 0.250 L = 0.256 M

So, the molarity of the solution is 0.256 M.