SO2, CO, CF4, OR H20? How can I tell?
2007-11-22 14:30:42 · 4 answers · asked by People J 2 in Science & Mathematics ➔ Chemistry
Just look up the boiling/melting points in any standard reference such as the CRC handbook. If you don't have the money for that you might be able to have a friend who works in a lab get you a copy of a chemical company catalog which will list many of the physical properties and costs nothing. In this case H2O is the least volatile it is the only one which is a liquid at room temperature the others are gases at RT.
2007-11-22 14:45:35 · answer #1 · answered by Flying Dragon 7 · 0⤊ 0⤋
Molecular weights: SO2=64 CO=28 CF4=88 H2O=18
Least volatile is H2O water, because of hydrogen bonding. The (+) H of H-O-H is attracted to the (-)O of the next H-O-H. Your teacher lectured on this. Pay attention.
2007-11-22 22:41:14 · answer #2 · answered by steve_geo1 7 · 0⤊ 0⤋
H2O.
Look for attractive forces between molecules of the various substances. SO2 and CO are dipoles, CF4 is nonpolar and only has dispersion forces, but H2O is not only a dipole, it can participate in a big way in H-bonding. Each of its H's can H-bond with different molecules of H2O, and its O has 2 unshared pairs of electrons, which can H-bond to 2 more H2O molecules. Water participates in 3.4 H-bonds per molecule, at 25'C, on the average.
2007-11-22 22:43:19 · answer #3 · answered by papastolte 6 · 0⤊ 0⤋
H20
2007-11-22 23:31:01 · answer #4 · answered by Anonymous · 0⤊ 0⤋