Answer:
I think
D : Hydrogen gas has two atom , and oxygen has one atom
Density can be any number, as long as it has the right units.
A unit of density has to be (a unit of mass) divided by (a unit of volume).
The most common one is gram/cm^3.
Answer:
The answer your looking for is option 2 - Inertia
The longest wavelength in the Molecule's absorption spectrum is 2250nm