Consider the equilibrium system below. if the system is at dynamic equilibrium, which statement is true?

a. sublimation of the nh4ci crystals stops.
b. solidification of the nh4ci vapors stops.
c. the rate of sublimation of the nh4ci crystals is equal to the rate of solidification of the nh4ci vapors.
d. the rate of sublimation of the nh4ci crystals is higher than the rate of solidification of the nh4ci vapors.

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.