The reaction below is spontaneous under standard conditions - true or false? br2(l) + mn2+(aq) → mno4-(aq) + br-(g) (in acidic solution) use the fact that the reduction potential for mno4-(aq) is +1.51 v and for br2(l) it is +1.065 v.

 The answer is false

Explanation:

             The given reaction is

At the cathod the potential is

                          [This because it will attract the negative

                                                       charge]

At the Anode the potential is

The overall potential of the  cell is

Since the potential of the cell is less than 0 then the reaction is not spontenous under standard condition

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.