Question

how do the melting and boiling points of water compare to that of other molecular compounds of similar molar mass?
a they are both much lower.
b they are both about the same.
c they are both much higher.
d the melting point is much lower, while the boiling point is much higher.

Explanation:

Water has strong hydrogen - bonding between its molecules. Hydrogen - bonding is a relatively strong intermolecular force. Other molecular compounds of similar molar mass usually have weaker intermolecular forces like London dispersion forces or dipole - dipole forces. Stronger intermolecular forces require more energy to break, resulting in higher melting and boiling points. So, water's melting and boiling points are much higher than those of other molecular compounds of similar molar mass.

Answer:

c. They are both much higher.