If the melting temperature of hydrogen is -259°C and the melting temperature of oxygen is -218°C then why is the melting temperature of water (H2O) 0°C?

Question

Shouldn’t it be around -245°C?

In: Chemistry

Answer 1

Because water molecules are polar, they tend to attract each other and easily form a liquid. Therefore you have to introduce a lot more energy (heat) to get them to separate into a gas.