Deep sea divers use a mixture of helium and oxygen to breathe. assume that a diver is going to a depth of 150 feet where the total pressure is 4.42 atm. the partial pressure of oxygen at this depth is to be maintained at 0.20 atm, the same as at sea level. what must be the percent by volume of oxygen in the gas mixture?

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

What is the polyatamic ion of thiosulfate

All cells are made of four types of acids, lipids, proteins, and carbohydrates.