Because water molecules are polar and carbon dioxide molecules are nonpolar,
a) water has a lower boiling point than carbon dioxide does.
b) attractions between water molecules are weaker than attractions between carbon dioxide molecules.
c) carbon dioxide cannot exist as a solid.
d) water has a higher boiling point than carbon dioxide does.

The correct is D.

Water is a polar molecule and it has polar bonds, which carry partially positive and partially negative charges. This polar bond increases the attraction between molecules of water and thus it requires a greater energy to break the bond between the molecules of water compare to carbon dioxide, which is a non polar molecule. Thus, water has a higher boiling point than carbon dioxide.

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.