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

# 2 mol of particles because naoh completely

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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.
gamboa (gg8745) – Homework #2 – holcombe – (51160) 5 0 1 x A 80 torr 40 torr If 3 mol of A and 6 mol of B are mixed, what is the vapor pressure of B? 1. 13 torr 2. 66 torr 3. 53 torr correct 4. 80 torr 5. 40 torr Explanation: The mole fraction of A is x A = mol A total mol = 3 mol 3 mol + 6 mol = 0 . 33 . 0 1 0 . 33 40 torr 53 torr 015(part2of3)10.0points What is the corresponding vapor pressure of A? 1.53 torr2.13 torrcorrect 3.66 torrAn unknown liquid has a vapor pressure of88 mmHg at 45C and a heat of vaporizationof 32 kJ/mol, what is its vapor pressure at55C? 5. 80 torr Explanation: 0 1 0 . 33 40 torr 13 torr 016(part3of3)10.0points What is the corresponding total vapor pres- sure? 1. 80 torr 2. 40 torr 3. 66 torr correct 4. 53 torr 5. 13 torr Explanation: 0 1 0 . 33 40 torr 66 torr 017 10.0points WITHDRAWN
gamboa (gg8745) – Homework #2 – holcombe – (51160) 6 1. 89 . 4 mmHg 2. 127 mmHg correct 3. 156 mmHg 4. 61 mmHg Explanation: Use the Clausius-Clapeyron Equation. Here, the only thing we don’t know is P 2 . ln parenleftbigg P parenrightbigg R parenleftbigg 1 parenrightbigg ln parenleftbigg P 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? 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?