Name __________________________________ Period ___ Date ___/___/___
13 • IMF's, Liquids, & Solids E X P L A I N I N G T R E N D S You may graph these on the graph paper box or use the online tools or use a larger piece of graph paper. Trend in Halogens 1. Graph the molar enthalpy of vaporization of F2 , Cl2 , and Br2 . Halogen Molar Mass ∆Hvap (kJ/mol) F2 38.0 6.6 Cl2 70.9 20.4 Br2 159.8 30.0 I2 253.8
Trend in H2O Analogs 5. Graph the molar enthalpy of vaporization of H2 O, H2 S, H2 Se, and H2 Te. Molecule Molar Mass ∆Hvap (kJ/mol) H2 O 18.0 40.7 H2 S 34.1 18.7 H2 Se 81.0 19.9 H2 Te 129.6 23.8
Molar Mass 2. 3. 4.
Predict the value of I2 : ____ kJ/mol What type of IMF is exhibited by these molecules? Why does the ∆Hvap increase for these molecules as the molar mass increases? Explain the trend in terms of IMF's.
Molar Mass 6. Identify the type of IMF for each molecule. Molecule Strongest IMF H2 O H2 S H2 Se H2 Te 7.
Explain the general shape of this graph.
Account for the trend in the larger three molecules in terms of IMF’s.