Final answer:
To calculate the mass percent (m/m) for the solute in a solution, divide the mass of the solute by the mass of the solution and multiply by 100%. In this case, the mass percent (m/m) of NaOH in the solution is 12.33%.
Step-by-step explanation:
To calculate the mass percent (m/m) for the solute in a solution, you need to divide the mass of the solute by the mass of the solution and multiply by 100%. In the given example, the mass of NaOH is 45 g and the mass of the NaOH solution is 365 g. Plugging these values into the formula, we have:
Mass percent (m/m) = (45 g / 365 g) * 100%
Simplifying the equation gives you:
Mass percent (m/m) = 12.33%