Final answer:
The density of the concentrated solution is either 1.61 g/mL or 1.61 g/cm³, as these units are equivalent and commonly used for liquids and solids. Options g/L and kg/m³ are not suitable for the concentrated solution.
Step-by-step explanation:
When discussing the density of solutions, it is crucial to use the correct unit to represent this physical property properly. The density of a substance is defined as the mass per unit volume. Given that solids and liquids are often measured in grams per cubic centimeter (g/cm³), and considering that 1 g/cm³ equals 1 g/mL, we can determine that the density of the concentrated solution is either 1.61 g/mL or 1.61 g/cm³. These two are equivalent as 1 cm³ is equal to 1 mL. This implies that the correct answers from the provided options would be 1) 1.61 g/mL and 2) 1.61 g/cm³.
Gases, meanwhile, are less dense and are commonly measured in grams per liter (g/L). The kilogram per cubic meter (kg/m³) is the SI unit for density, which is not typically used in laboratories due to its large scale for solids and liquids. Nonetheless, for the sake of understanding conversion, it's important to recognize that 1 g/cm³ is equivalent to 1000 kg/m³. In this case, however, we are looking for higher density units more suitable for liquids and solids, not gases or large-scale measurements, making the options involving g/L and kg/m³ irrelevant