Atomic masses are usually expressed as averages due to the existence of what phenomenon?

How many atoms of oxygen are contained in 160 grams of n2o3

Using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 pb+2(aq) + 2cl -(aq). if the value of ksp was determined to be only 1.2 x 10-2: too much solid has dissolved. additional precipitate is forming. the solution is unsaturated. the ions are now combining to reduce their concentrations.

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.