If you add 25.0 g NaCl (MW = 58.4 g/mole) to 50.0 mL of water what is the resulting molarity in M?
Question
Solution
To calculate the molarity, you need to know the number of moles of solute (in this case, NaCl) and the volume of the solvent (water) in liters.
Step 1: Calculate the number of moles of NaCl. You can do this by dividing the mass of the NaCl by its molar mass.
Number of moles = mass (g) / molar mass (g/mole) = 25.0 g / 58.4 g/mole = 0.428 moles
Step 2: Convert the volume of water from mL to L. 1 L = 1000 mL, so 50.0 mL = 0.050 L
Step 3: Calculate the molarity. Molarity (M) = moles of solute / liters of solvent = 0.428 moles / 0.050 L = 8.56 M
So, the resulting molarity of the solution is 8.56 M.
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