Calculate the standard entropy of vaporization of ethanol, C2H5OH, at 285.0 K, given that the molar heat capacity at constant pressure of ethanol vapor is 78.3 J

The standard entropy of vaporization of ethanol is 0.275 J/K

Explanation:

Using Gibbs Helmholtz equation:

For a phase change, the reaction remains in equilibrium, thus

Given: Temperature = 285.0 K

Putting the values in the equation:

Thus  the standard entropy of vaporization of ethanol is 0.275 J/K

  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-

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a