Jaytu What best describes the sample at point D? temperature (°C) 140 120 100 80 60 C 40 B 20 0' -201 A -40 D heat absorbed pure liquid the first bubbles of steam start to form E

The fragment of H2O phase diagram is shown. What transition (e.g. liquid->solid, solid->gas... or none) would be observed when a sample of H2O initially at 0.003 atm and -5 C is heated at constant pressure to 0 C?

What is the answer to this question?

Suppose the vapor pressure of a substance is measured at twodifferent temperatures. (a) By using the Clausius–Clapeyronequation (Equation 11.1) derive the following relationshipbetween the vapor pressures, P1 and P2, and the absolute temperaturesat which they were measured, T1 and T2:   (b) Gasoline is a mixture of hydrocarbons, a componentof which is octane (CH3CH2CH2CH2CH2CH2CH2CH3). Octane has a vapor pressure of 13.95 torr at 25 °C and a vaporpressure of 144.78 torr at 75 °C. Use these data and the equationin part (a) to calculate the heat of vaporization of octane.(c) By using the equation in part (a) and the data given in part(b), calculate the normal boiling point of octane. Compareyour answer to the one you obtained from Exercise 11.81.(d) Calculate the vapor pressure of octane at -30 °C.

Only #4

2. Which one of the following statements is incorrect? (a) According to the Gibbs phase rule, four phases of a pure substance cannot exist (b) All triple points correspond to a gas-liquid-solid equilibrium (c) The triple point in a P-T diagram becomes a triple line in a P-V diagram (d) The chemical potential determines which of several phases is the most stable

This gra v ows how the vapor pressure of three liquids varies with temperature: 900- 800- 700 600 500 400 300- - isopropyl acetate benzene 200 100- tetrahydrofuran 50 60 temperature, °C Use the graph to answer the following questions: most volatile: choose one Which liquid is the most volatile? Which is the least volatile? least volatile: choose one isopropyl acetate: What is the normal boiling point of each liquid? Note: your answer must be within 1°C of the exact answer to be graded correct. benzene: tetrahydrofuran: O more Suppose a beaker of benzene is put inside a sealed tank containing benzene gas at 55. degree C and 884. torr. After ten minutes, will there be more liquid in the beaker, less liquid, or the same amount? O less O the same vapor pressure, torr

Rank the following substances in increasing boiling points (left-to-right). (a) CH4, C,H6, C;Hs, C4H10; (b) HF, HCI, HBr, and HI; (c) NH3, PH3, ASH3, and SbH3; (c) CH3OH, CH;CH;OH, CH3CI, and CH;CH;Cl; 2.

The vapor pressure of liquid chloroform, CHCL3, is 100 mm Hg at 283K. A  0.302g sample of liquid  CHCL3 is placed in a closed, evacuated 360 ml container at a temperature of 283K.  Assuming that the temperature remains constant, will all of the liquid evaporate?  What will the pressure un the container be when equilibrium is reach?

17. For the situation below, sketch the temperature-time graph. Be sure to include beginning and ending temperatures as well as the temperature during any phase chae e. Label which phase(s) is(are) present in each portion of the curve. A sample of liquid water at 30°C is he: heve of it f of it boht away. i i bolooofbulo slat incre time temperature