Recitation Activity 3 Chemistry 122

Recitation Activity 3 Chemistry 122 - C and 8.25 atm at...

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Recitation Activity 3 Chemistry 122, Dr. Loza Week of Jan 21, 2008 Review of Bonding/Molecular Geometry (Chapters 8 and 9) In the following list, circle the compounds that are likely to have a dipole moment, i.e. those that are polar molecules. HF H 2 O CO CO 2 BF 3 NH 3 CH 4 CH 3 OH C 6 H 6 Intermolecular Forces Which molecule in each pair has stronger intermolecular forces? H 2 or CH 4 CH 3 OCH 3 or CH 3 CN CH 3 CHO or CH 3 OCH 3 Phase Changes Calculate the heat required to convert 50 g H 2 O at -5 o C to steam at 110 o C. specific heat ice 2.09 J/g o K specific heat water 4.18 J/g o K specific heat steam 1.84 J/g o K H fus (ice) 334 J/g H vap (liquid water) 2260 J/g Vapor Pressure Calculate the molar heat of vaporization (kJ/mol) for a material which has a vapor pressure of 0.225 atm at 123.7
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Unformatted text preview: C and 8.25 atm at 436.0 C. R = 8.314 J/mol K. Phase Diagrams Sketch the phase diagram for a hypothetical material given the following points: normal melting point (-120 o C); normal boiling point (-50 o C); triple point (-100 o C, 0.10 atm); sublimation point (-130 o C, 0.03 atm); and critical point (-20 o C, 40 atm). True or false?. If pressure increases from 0.010 atm to 5 atm at -75 o C, one phase change occurs. If temperature decreases from 0 o C to -125 o C at 0.95 atm, two phase changes occur. The substance is a gas under ordinary lab conditions (25 o C, 1 atm). The melting point decreases as pressure increases....
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