10.00 mL of 0.10 M NaOH is added to 25.00 mL of 0.10 M HCl during a titration. Which expression shows how many moles of OH- are present in the solution?
How many moles of H+ will be present following neutralization? (Write answer to four decimal places.)
moles H+ =
DONE

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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.