how is the Law of Conservation of Mass is applied in the balanced equation 2Na(s) + 2H2O(l) to form 2NaOH(aq) + 1 H2(g)

The molality of calcium chloride (cacl2) in an aqueous solution is 2.46 m. what is mole fraction of the solute?

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.