Density of methane (CH4): 0.717 kg/m³ at 0°C and 1 atm

Density of water (H2O): 1000 kg/m³ at 4°C

As you can see, the density of methane is significantly lower than the density of water. This is because:

* Molecular weight: Methane has a lower molecular weight than water (16 g/mol vs. 18 g/mol).

* Intermolecular forces: Methane molecules are held together by weak Van der Waals forces, while water molecules are held together by strong hydrogen bonds. This stronger bonding in water leads to a more compact structure and higher density.

Therefore, methane is less dense than water and will float on water.