Answer:To solve this problem, we can use the formula for calculating the mass of the solute in a solution: Given: - Volume of solution = 500 ml- Percentage of pure salt in the solution = 20%- Density of the solution = 1.12 g/mL First, we need to calculate the mass of the solution using the formula: Then, we can calculate the mass of pure salt in the solution using the formula mentioned earlier. Let's calculate the mass of pure salt dissolved in this solution step by step.The mass of pure salt dissolved in the 500 ml 20% salt solution is 112.0 grams. Here's a summary of the calculations: 1. The mass of the solution is .2. The mass of pure salt in the solution is . Therefore, the mass of pure salt in the solution is 112.0 grams.