Question

WIRUS wereo Which substance would produce the largest boiling point elevation when added to 500 grams of water? All given substances dissolve completely in water. O A 1.6 mol Naci O B 3.2 mol ethanol O C 1.1 mol MgCl2 O D 2.2 mol ethylene glycol (HOCH2 CH2OH) E 3.4 mol methanol

Answer 1

. " m Atb = 1 x Kn x m La Van't hoff factor - molarity = moles of Solute mass of so went m 1=1 Chor Organic solutes that don't dissociate). (A) (A) 1.6 mol i = 2 m 1.6 mol Nach , Nadia Nat 1.6 3.2m. : 0.5 AT6 = 2 x K6 x 3.2 b = . 6.4 Kb 0.5 16 (c) Si= 3 S ie m = 1 3.2 mol ethanol (Organic) M: 3.2 = 6.4m .: Atb = 1x Kbx6:4 = 6.4 Kb Il mol mg cla, MgCl₂ might2cí mg +201, neema lol. 2-2m b = 3 x Kb x 2.2 6.6 Kb 2.2 mol ethylene glycol (organic) ma 2-2 : 4.4 m .. Alb 1x Kb* 4.4 = 4.4 Kb . 3.4 mol methanol (organic) m: 346-8 m o = 1xKb X 6.8 0.5 (e) = 6.8kb :. (E) is the correct answer