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?

4.525% is the percentage by volume of oxygen in the gas mixture.

Explanation:

Total pressure of the mixture = p = 4.42 atm

Partial pressure of the oxygen =

Partial pressure of the helium =

(Dalton law of partial pressure)

According Avogadro law:

(At temperature and pressure)

Volume occupied by oxygen gas  =

Total moles of gases = n = 1 mol

Total Volume of the gases = V

Percent by volume of oxygen in the gas mixture:

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.