If 5 gases in a cylinder each have a partial pressure of 2.50 atm ,what is the total pressure exerted by the gases?

12.5 atm.

Explanation:

Ptotal = P1 + P2 + … + Pn.

∴ Ptotal = P of gas 1 + P of gas 2 + P of gas 3 + P of gas 4 + P of gas 5.

∴ Ptotal = 5(2.5 atm) = 12.5 atm.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.  

a physical change biology

explanation: