Diffusion of ammonia in an aqueous solution. an ammonia (a)-water (b) solution at 278 k and 4.0 mm thick is in contact at one surface with an organic liquid at this interface. the concentration of ammonia in the organic phase is held constant and is such that the equilibrium concentration of ammonia in the water at this surface is 2.0 wt 'yo ammonia (density of aqueous solution is 991.7 kg/m3) and the concentration of ammonia in water at the other end of the film 4.0 mm away is 10 wt % (density of 961.7 kg/m3). water and the organic are insoluble in each other. the diffusion coefficient ofnh3 in water is 1.24 x 10- 9 m 2/scalculate the flux n_b. explain.

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

the answer is d. 74.02

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