If you obtained a sample of rock from Venus and determined the abundances of and in it, and found that for every 1 uranium atom there were 3 lead atoms, then what would the age of this rock be

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.