Determine whether the stopcock should be completely open, partially open, or completely closed for each activity involved with titration. Filling the buret with titrant Choose... At the beginning of a titration Choose... Close to the calculated endpoint of a titration Choose... Conditioning the buret with titrant

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explanation:

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)

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.