Consider the following reaction:
nh4hs(s)_nh3(g)+h2s(g)
an equilibrium mixture of this reaction at a certain temperature was found to have [nh3]= 0.272m and [h2s]= 0.365m .

what is the value of the equilibrium constant (kc) at this temperature?

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

In which situation can a mixture always be called a solution

Achemistry student weighs out 0.306 g of citric acid (h3c6h5o7), a triprotic acid, into a 250 ml volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with 0.1000 m naoh solution. calculate the volume of naoh solution the student will need to add to reach the final equivalence point. be sure your answer has the correct number of significant digits.