How many moles of O are present in 3.5 mol of Al2(SO4)3

This flow chart shows the amount of energy that is emitted by each type of light. ultraviolet > blue light > yellow light > red light (maximum energy) (minimum energy) in an experiment, shining which type of light on a strip of metal would be least likely to produce the photoelectric effect? ultraviolet light dim blue light bright red light bright yellow light

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.