Find the AH° for the reaction of two moles of aqueous ammonium hydroxide and one mole of aqueous calcium chloride that produces two moles of aqueous ammonium
chloride and one mole of solid calcium hydroxide.
2NH4OH(aq) + CaCl2(aq) 2NH4Cl(aq) + Ca(OH)2(s)

A) -31.04kJ

B) -1585.41kJ

C) -67.2kJ

D) -3103.61kJ

E) -1518.2kJ

Embryos of different species look very similar, which shows that the organisms share a ancestor.

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?

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.