"determine how the reactions need to be modified to sum to the overall process. a. c(s)+o2(g)→co2(g)k=1.363×1069 b. 2h2(g)+o2(g)→2h2o(g)k=1.389×1080 c. 2co(g)+o2(g)→2co2(g)k=1.477×1090"

i think it's letter a.

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)

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.