Ammonium nitrate (nh4no3) dissolves readily in water even though the dissolution is endothermic by 26.4 kj/mol. the solution process is spontaneous because

In this given scenario, ammonium nitrate dissolves readily in water even though the dissolution is endothermic. The solution process is spontaneous because of the increase of the disorder upon dissolution of this strong electrolyte. In addition, the ions are much more stable in a solution to the extent that ambient heat will be absorbed to complete the process.

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c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.