10 points Question #12: If a chemist has a stock solution of HBr that is 20.0 Mand
would like to make 900.0 mL of 6.0 M HBr, how much of his stock
solution should he dilute?*
O A. 2.70 mL
B. 27.0 mL
C. 270 mL
D. 2,700 mL
Please need done quick

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.

What information does a complete ionic equation give that the balanced equation doesn’t show?

Listenbase your answer to the question on the information below. nuclear radiation is harmful to living cells, particularly to fast-growing cells, such as cancer cells and blood cells. an external beam of the radiation emitted from a radioisotope can be directed on a small area of a person to destroy cancer cells within the body. cobalt-60 is an artificially produced radioisotope that emits gamma rays and beta particles. one hospital keeps a 100.0-gram sample of cobalt-60 in an appropriate, secure storage container for future cancer treatment. which choice represents the correct product for the beta decay of the co-60? fe-60ni-60fe-61ni-61