Chemical thermodynamics does not answer about the

Options

A. feasibility of a reaction
B. extent of a reaction
C. speed of a reaction
D. Both '1' and '2'

Answer

C

Explanation

The laws of thermodynamics help us to predict (through `DeltaG`) whether or not a reaction will take place and once started, how far (through `k_(eq.))` the reaction goes before it reaches the equilibrium state. For example, thermodynamics tells us that `H_(2)O` does not ordinary conditions as `DeltaG^(@)` is `+ve` . Therefore, the position of equilibrium in the reaction
`H_(2)O(l)hArrH_(2)(g)+(1)/(2)O_(2)(g)`
lies far to the left `(k_(eq.)=3xx10^(-42))` . If we want this change to happen, we must force it to happen (for example, by passing an electric current through water). Thermodynamics also tells us that the reverse process, in which `H_(2)` and `O_(2)` from water is spontaneous. All we have to do is wait, and water should eventually be formed. Thermodynamics does not tell us that it will be a very long wait, because the reaction occurs very slowly. Chemical kinetics gives us this information. Kinetics also tells us that .`H_(2)` and `O_(2)` will react very quickly if a spark is applied to the mixture of the two gases. So quickly that an explosion may ocuur.
Therefore are many such examples in everyday life. Thermodynamic tells us that the constents of an egg will change from liquid to solid spontaneously. Kinetics tells us that the best way to make this change occur is to put the egg in boiling water. Thermodynamics tells us that nitrous oxide `(N_(2)O)` , the propellant in a can of whipped cream, is unstable and forms `N_(2)` and `O_(2)` spontaneously. Kinetics tells us that the nitrous oxide dissociates so slowly that we need not rush to use a can or whipped cream.