Final answer:
The total mass of a 4.00% NaOH solution containing 15.0 g of NaOH is calculated by dividing 15.0 g by the percentage concentration (0.04) and multiplying by 100%, resulting in 375 g (a).
Step-by-step explanation:
The question is asking to determine the total mass of a sodium hydroxide (NaOH) solution with a given concentration that contains a specific amount of NaOH.
To find the mass of a 4.00% NaOH solution that contains 15.0 g of NaOH, we need to set up a proportion based on the percentage concentration:
4.00% = 15.0 g / total mass of solution * 100%
Solving for the total mass of the solution, we get:
total mass of solution = (15.0 g / 4.00) * 100
total mass of solution = 375 g
The answer is (a) 375 g.