Final answer:
To calculate the amount of salt obtained by evaporation from seawater, we need to find the mass of salt in the given volume. By using the concentration of salt and the density of seawater, we can calculate the mass of salt and convert it to kilograms.
Step-by-step explanation:
To calculate the amount of salt that can be obtained by evaporation, we first need to find the mass of salt in the seawater. Assuming the 3.5% concentration is by mass, we can calculate:
Mass of salt = 3.5% x 3490 liters x density of seawater
Next, we convert the mass of salt to kilograms:
Mass of salt in kg = Mass of salt in g / 1000
Finally, we round the result to two decimal places:
Mass of salt in kg = [calculated value]