umber on the answer form umber, fill in the circle containing the digit corres! pve. wion and, with a dark pencil, or a black or blue pen that answer in the row corresponding to the question can be filled in. You make a mistake, cross it out and fill in another circle. SECTION A - 20 QUESTIONS - 40 MINUTES 1. A bottle is filled with a small amount of a volatile liquid and sealed. Sometime later that no liquid is evident in the sealed bottle. Which of the following statements wou observation? a. More time is needed to establish equilibrium. b. Liquid and vapor are at equilibrium in the bottle. c. Too little liquid was added to achieve a liquid vapor equilibrium in the closed sys d. The vapor state is favored when equilibrium is established. e. The liquid has undergone sublimation.
Added by Temoso M.
Close
Step 1
After some time, no liquid is evident in the sealed bottle. This suggests that the liquid has evaporated and turned into vapor. Option a suggests that more time is needed to establish equilibrium. However, the question states that no liquid is evident, which Show more…
Show all steps
Your feedback will help us improve your experience
Dinesh Singh and 96 other Chemistry 101 educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Question 6 A solid which cleaves in a random fashion and has no definite melting point is likely to be: amorphous covalent isomorphic polymorphic crystalline Question 7 The phase diagram for a pure substance is shown below. A substance at point H is: at equilibrium between liquid and gas in the liquid phase in the gas phase in the solid phase at equilibrium between solid and liquid Question 8 A compound made of elements A and B, has a cubic unit cell. There is an A atom at each corner of the cube and an A atom at the center of each face of the cube. There are eight B atoms that lie entirely within the unit cell. Based on this information, the empirical formula for the compound is: AB2 AB3 A4B2 AB A2B Question 9 Which of the following increases the solubility of a gas in a given solvent? decreasing the temperature of the gas increasing the temperature of the solvent decreasing the partial pressure of the gas increasing the temperature of the solvent and decreasing the partial pressure of the gas simultaneously none of the above Question 10 The solubility of carbon dioxide in water is 0.161 g/100 ml at 20°C and a partial pressure of carbon dioxide of 1.00 atm. A soft drink is carbonated with CO2 at 5.0 atmospheres. What is the solubility (in g/100 ml) in water at this pressure? .0322 .644 .0403 .966 .805
Dinesh S.
Vapor-liquid equilibrium calculations can sometimes be simplified through the use of a quantity called the relative volatility, which may be defined in terms of the following depiction of vapor and liquid phases in equilibrium:The relative volatility of species $i$ to species $j$ is $$\alpha_{i j}=\frac{y_{i} / x_{i}}{y_{j} / x_{j}}=\frac{y_{i} / y_{j}}{x_{i} / x_{j}}$$ If $\alpha_{i j}$ is much greater than $1,$ species $i$ is much more volatile than species $j$ (i.e., , it has a much greater tendency to vaporize at the system temperature and pressure); conversely, if $\alpha_{i j} \ll 1,$ species $i$ is much less volatile than species $j$. The closer $\alpha_{i j}$ is to 1 , the more difficult it is to separate species $i$ from species $j$ by a process such as distillation or partial condensation of a vapor mixture. (a) Show that the relative volatility of species A to species $\mathrm{B}, \alpha_{\mathrm{AB}},$ equals the ratio of vapor pressures at the system temperature, $p_{\mathrm{A}}^{*} / p_{\mathrm{B}}^{*}$, if both species obey Raoult's law and follow ideal-gas behavior. (b) Determine the relative volatility of styrene to ethylbenzene at $85^{\circ} \mathrm{C}$ and the relative volatility of benzene to ethylbenzene at the same temperature. Which pair would you classify as more difficult to separate by distillation?(c) Show that for a binary mixture of $i$ and $j$.$$y_{i}=\frac{\alpha_{i j} x_{i}}{1+\left(\alpha_{i j}-1\right) x_{i}}$$ (d) Apply the equation from Part (c) to a benzene-ethylbenzene system at $85^{\circ} \mathrm{C},$ using it to estimate the mole fractions of benzene in the vapor phase in equilibrium with liquids having benzene mole fractions of $0.0,0.2,0.4,0.6,0.8,$ and $1.0 .$ Then calculate the total system pressure for each of these six conditions.
A sample A of liquid water and sample B of ice, of identical mass, are placed in a thermally insulated container and allowed to come to thermal equilibrium. Figure [8-25a] is a sketch of the temperature T of the samples versus time. (a) Is the equilibrium temperature above, below, or at the freezing point of water? (b) In reaching equilibrium, does the liquid partly freeze, fully freeze, or undergo no freezing? (c) Does the ice partly melt, fully melt, or undergo no melting? Question continued: Graphs b through f of Fig: 18-25 are additional sketches of T versus time, of which one or more are impossible to produce: (a) Which is impossible and why? (b) In the possible ones, is the equilibrium temperature above, below, or at the freezing point of water? (c) As the possible situations reach equilibrium, does the liquid partly freeze, fully freeze, or undergo no freezing? Does the ice partly melt, fully melt, or undergo no melting?
Prem B.
Recommended Textbooks
Chemistry: Structure and Properties
Chemistry The Central Science
Chemistry
Watch the video solution with this free unlock.
EMAIL
PASSWORD