Chemistry Help!?!?!?!!?

Question

A.) SO2 is an important oxide of sulfur. The critical temperature of SO2 is 158 ºC and the critical pressure is 78.0 atm. Predict if SO2 can be liquefied by applying pressure at 180º C. Explain your answer

B.)Carbon disulfide, CS2, is a volatile flammable liquid. It has a vapor pressure of 400.0 mmHg at 28.0 ºC and 760 mmHg at 46.5 ºC. What is the enthalpy of vaporization of CS2?

C.) Metallic gold forms cubic crystals whose unit cell has an edge length of 407.9 pm. The density of gold is 19.3 g/cm3. Calculate the number of gold atoms in a unit cell. What type of cubic lattice does gold have (FCC or BCC or SC)?

D.) Classify the following according to the forces of attraction (intermolecular forces) that exist between these solids a) solid ammonia, NH3, b) cesium Cs, c) Cesium iodide CsI, d) silicon Si

E.)Arrange the following in the order of increasing boiling point
i) CH3OH
ii) CH2OH----CH2OH
iii) CH3----CH3
iv) CH4

Answer 1

A) Thecritical temperature is 158C. You ask about SO2 at 180C. A gas cannot be liquefied by any pressure above its critical temperature. So SO2 cannot be liquefied above 152C

D) a) Van der Waals b)Metallic c) Ionic d) Covalent

E) CH4 < CH3CH2 < CH3OH < HOCH2CH2OH