Plsss help We mix 3.0•10^-2 mol of HNO2 with 5.0•10^-2 mol of NaNO2 and we add enough water to have 2.0L.
a) whats the pH of the solution
b) whats the reactions equation when we add HCl

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds

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.