Q 12 - ENEM 2014 - SOLUÇÕES

12. Homemade serum is used to combat dehydration by replacing water and mineral salts lost, for example, due to diarrhea. A simple recipe for its preparation consists of using two large (soup) spoons of sugar and two small (coffee) spoons of table salt, dissolved in 2 L of boiled water, obtaining a solution with a sodium ion concentration of 1.4 mg/mL. Consider the molar masses: NaC⁡l=58.5 g/(mol;) Na = 23 g/mol. What is the closest value to the mass, in grams, of sodium chloride present in a single small spoonful? a) 0.7 g b) 1.8 g c) 2.8 g d) 3.6 g e) 7.0 g