2 mol of particles because NaOH completely dissociates in water II will have 14

# 2 mol of particles because naoh completely

• Notes
• 7
• 100% (1) 1 out of 1 people found this document helpful

This preview shows page 4 - 7 out of 7 pages.

I) will have 1.2 mol of particles because NaOH completely dissociates in water. II) will have 1.4 mol of particles because KCl completely dissociates in water. III) will have 1.5 mol of particles because Na 2 CO 3 completely dissociates in water. IV) will have 1 mol of sugar in solution because it is soluble but does not dissociate. The higher the concentration, the greater the boiling point elevation, so IV > I > II > III . 014(part1of3)10.0points Consider the following pressure diagram for a binary liquid containing A and B.
clow (twc432) – Homework #2 – holcombe – (51160)501xA80 torr20 torr If 7 mol of A and 6 mol of B are mixed,what is the vapor pressure of B? What is the corresponding vapor pressure ofA? 2.36 torr 3.10 torrcorrect4.47 torr 5.80 torrExplanation: 010.54 20 torr10 torr016(part3of3)10.0points What is the corresponding total vapor pres-sure? 1.47 torrcorrect2.36 torr3.20 torr4.10 torr5.80 torrExplanation:010.5420 torr47 torr 017 10.0points WITHDRAWN 018 10.0points An unknown liquid has a vapor pressure of88 mmHg at 45C and a heat of vaporizationof 32 kJ/mol, what is its vapor pressure at55C?
clow (twc432) – Homework #2 – holcombe – (51160) 6 1. 156 mmHg 2. 61 mmHg 3. 127 mmHg correct 4. 89 . 4 mmHg Explanation: Use the Clausius-Clapeyron Equation. Here, the only thing we don’t know is P 2 . ln parenleftbigg P 2 P 1 parenrightbigg = Δ H vap R parenleftbigg 1 T 1 - 1 T 2 parenrightbigg ln parenleftbigg P parenrightbigg parenleftbigg 1 parenrightbigg ln P 2 = 32 , 000 8 . 31 01910.0pointsA portion of two volatile liquids are pouredinto an evacuated container, filling the con-tainer halfway. The container is then sealed.After equilibrium is established, the measuredpressure is less than expected (negative devi-ation from Raoult’s Law). What is definitelyTRUE about the mixture? Explanation: Raoult’s Law applies to the vapor pressure of the mixture, so a positive deviation means that the vapor pressure is higher than ex- pected for an ideal solution and a negative deviation a lower vapor pressure. Negative deviation will occur when the interactions between the different molecules are some- what stronger than the interactions between molecules of the same kind. 020 10.0points Two aqueous solutions are separated by a semipermeable membrane. Solution A = 0.34 M KCl Solution B = 0.64 M KCl Which of the following statements is TRUE? 1. K + ions flow from solution B to solution A.