Which of the following reactions is (are) spontaneous at standard conditions? A) 2NO3^-(aq) + 8H^+(aq) + 6Cl^- —> 2NO(g) + 4H2O + 3Cl2(g)

B) O2(g) + 4H^+(aq) + 4Cl^-(aq) —> 2H2O + 2Cl2(g)

C) 3Fe(s) + 2AuCl4^-(aq) —> 2Au(s) + 8Cl^-(aq) + 3Fe^2+(aq)

8

explanation:

each principal energy level above the first contains one s orbital and three p orbitals. a set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

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  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

it takes on an electronical energy