In the formula for water ,(h2o), what does the lack of subscript after the o indicate? a. there are no oxygen atoms in the compound. b. there is one oxygen atom in the compound. c. there is one molecule in the compound. d. there are two oxygen atoms in the compound. i need fast.

The size (radius) of an oxygen molecule is about 2.0 ×10−10m. make a rough estimate of the pressure at which the finite volume of the molecules should cause noticeable deviations from ideal-gas behavior at ordinary temperatures (t= 300k ). assume that deviatons would be noticeable when volume of the gas per molecule equals the volume of the molecule itself.