Question

Why does it take much more energy to melt 1 mol of ice than it does to melt 1 mol of methane at their melting points?

Answer 1

Hydrogen bonding

Step-by-step explanation:

Methane molecules are only held by weak Van den Waals forces. Lesser energy is required to break the intermolecular forces during the melting of methane. However, hydrogen bonds which bind water molecules together are stronger and require greater energy to break. Hence it takes higher energy to melt one mole of ice.