2. A sample of dry ice (solid CO2) is cooled to 173 K (-100.0 °C), and is set on a table at room temperature (298 K; 25 °C). At what temperature is the rate of sublimation and deposition the same (assume that pressure is held constant at 1 atm)?

Mercury has a density of 13.69 g/cm3 in the liquid state and 14.193 x 103 kg/m3 in the solid state, both measured at the melting point of 234.33 K at 1 bar. If the heat of fusion of mercury is 9.7876 kJ/kg. What is the melting point of mercury at 7 bar?

(2) Sublimation. Figures below represent the phase diagrams for water and carbon dioxide. (a) Describe the difference in sublimation behavior under the pressure and temperature conditions prevailing on Earth. (b) How would you explain the sublimation of the polar ice caps on Mars during the Martian Summer? 217.7 METING FREZING Normal melting point Solid -Normal boiling point Liquid VAPOURISON COKDENSATION Gas 0.006 SUBLIMATION DEPOSITION 100 374.4 Temperature ("C) Pressure (atm)

Consider the phase diagram shown. What is the normal sublimation point at 1 atm? Pressure (not to scale) 72.9 atm 5.1 atm 1 atm O 0°C O 100°C -56.7 °C 31°C -78.5 °C SOLID LIQUID GAS -78.5 °C -56.7 °C Temperature (not to scale) 31 °C

Substance X is known to exist at 1 atm in the solid, liquid, or vapor phase, depending on the temperature. Additionally, the values of these other properties of X have been determined: melting point enthalpy of fusion - 10. °C boiling point 4.00 kJ/mol enthalpy of vaporization 30. °C 39.00 kJ/mol 3 1.60 g/cm³ (solid) 1 1 density 44. J.K ·mol (solid) 1.30 g/mL (liquid) 1 -1 heat capacity 64. J.K ·mol (liquid) 1 1 54. J.K mol (vapor) You may also assume X behaves as an ideal gas in the vapor phase. Suppose a small sample of X at -50 °C is put into an evacuated flask and heated at a constant rate until 10.0 kJ/mol of heat has been added to the sample. Graph the temperature of the sample that would be observed during this experiment. temperature (°C) 50- 40 30. 20 10. -10 -20 -30 -40 -50 0 1 2 3 4 5 6 7 8 9 10 heat added (kJ/mol) ☑ ? 00. 18 Ar

3. Explain the process of sublimation Name one substance that sublimes at room temperature and pressure.

Suppose that 0.87 gg of water condenses on a 85.0 gg block of iron that is initially at 20 °C.C. If the heat released during condensation goes only to warming the iron block, what is the final temperature (in oC) of the iron block? (Assume a constant enthalpy of vaporization for water of 44.0 kJ/mol and a heat capacity for iron of 0.449 J/(g-oC).) Express your answer in degrees Celsius to two significant figures.

Ethanol has a density of 0.789 g/cm3 and a  vapor pressure of 5.95 kPa at 20.0 C. A sample of liquid ethanol is subjected to an additional  pressure of 8.53 MPa of Kr. What is the vapor  pressure of ethanol under these conditions?

Vanadium crystallizes in a body centered cubic cell (the V atoms occupy only the lattice points). The density of V is 6.0 g/cm^3. Calculate the unit cell edge length in pm. Round your answer to 2 significant digits.

12. The fictitious element Tulanium forms a body centered cubic crystal in the solid state. The molar mass of Tulanium is 165.32 g/mol and the density of the solid is 8.32 g/cm3. What is the atomic radius Tulanium? Give you answer in pm (10-10cm).