Final answer:
An osmolality less than 280 mOsm/kg is considered hypotonic, as it indicates the solution has a lower concentration of solutes compared to typical body fluids, which are maintained within a range of 280 to 300 mOsm/kg.
Step-by-step explanation:
Osmolality, a measurement of the quantity of dissolved particles in a fluid, is crucial for comprehending the relative concentrations of body fluids in relation to cells in biological systems. A hypotonic solution contains fewer solutes because its osmolality is lower than that of the cytoplasm of a cell. Given the facts given, a hypotonic solution's osmolality should be less than 280 mOsm/kg because normal bodily fluids are kept between 280 and 300 mOsm/kg. As a result, an osmolality below 280 mOsm/kg is regarded as hypotonic since it is below the mean osmolality of bodily fluids.