Acetylene, c2h2, has a standard enthalpy of formation, δh° = 226.7 kj/mol, and a standard entropy change for its formation from its elements, δs° = 58.8 j/k•mol. the standard free energy of formation of acetylene is kj/mol.

Explanation:

The given data is as follows.

      = 226.7 kJ/K mol,      

      = 58.8 J/mol =

         T = = (25 + 273) K = 298 K

Now, calculate the standard free energy of formation of acetylene () as follows.

                        = 226.7 - kJ/mol - 298 K \times 58.8 \times 10^{-3} kJ/K mol[/tex]

                        = 209.2 kJ/mol

Thus, we can conclude that the standard free energy of formation of acetylene is 209.2 kJ/mol.

  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-