Percent composition of aluminum oxide, you must show your work

How to convert a density of 0.791g/cm3 to lb/ft3

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.