Latanya brown is a nine-year old african american who is hospitalized with acute sickle cell crisis. the pharmacist is preparing intravenous fluids for this patient. she adds 2 grams of potassium chloride to 1 l of d5w/1/2 normal saline. what is the estimated osmolarity per liter (mosm/l) of this solution assuming the final volume is 1L (mw of sodium =23, potassium=39, chloride=35.5, and dextrose is 198)?