A geochemist measures the concentration of salt dissolved in Lake Parsons and finds a concentration of 47.·gL−1. The geochemist also measures the concentration of salt in several nearby non-isolated lakes, and finds an average concentration of 5.89·gL−1.Assuming the salt concentration in Lake Parsons before it became isolated was equal to the average salt concentration in nearby non-isolated lakes, calculate the percentage of Lake Parsons which has evaporated since it became isolated.Round each of your answers to 2 significant digits.

To calculate the percentage of Lake Parsons which has evaporated since it became isolated, we need to compare the current salt concentration to the original salt concentration.

Step 1: Identify the initial and final concentrations of salt. The initial concentration (Ci) in Lake Parsons was 5.89 gL-1 (the same as the average concentration in nearby non-isolated lakes). The final concentration (Cf) in Lake Parsons is 47 gL-1.

Step 2: Use the formula for concentration change due to evaporation. The formula is: Cf = Ci / (1 - E), where E is the fraction of the lake that has evaporated.

Step 3: Rearrange the formula to solve for E. E = 1 - (Ci / Cf)

Step 4: Substitute the given values into the formula. E = 1 - (5.89 gL-1 / 47 gL-1)

Step 5: Calculate the value of E. E = 1 - 0.125 = 0.875

Step 6: Convert the fraction to a percentage. E = 0.875 * 100 = 87.5%

So, approximately 87.5% of Lake Parsons has evaporated since it became isolated.