Heating copper(ii) oxide at 400°c does not produce any appreciable amount of cu: cuo(s) ⇆ cu(s) + 1 2 o2(g) δg o = 127.2 kj/mol however, if this reaction is coupled to the conversion of graphite to carbon monoxide, it becomes spontaneous. write an equation for the coupled process and calculate the equilibrium constant for the coupled reaction. be sure to include the states of the chemical species.

Explanation:

The reaction is as follows.

As, value of is positive. Therefore, reaction is non-spontaneous.

                  = [-137.2 - (127.2 kJ/mol)]

                  = -10 kJ/mol

Since, value of is negative here so, reaction is spontaneous.

Also,   = -RT ln

where,        R = 8.314 J/mol K

                  T = = (400 +  273) K = 673 K

                  K = equilibrium constant

           100 =

           log K = 0.00776

              K = 1.018

Therefore, we can conclude that equilibrium constant for the coupled reaction is 1.018.

Explanation:

Hello,

In this case, the coupled process contains the following two chemical reactions:

By taking the total Gibbs free energy for this coupled reactions:

In such a way, we compute the equilibrium constant as follows:

Best regards.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

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