A student writes the following statements about the relationship between mass defect and nuclear binding energy. 1. When an isotope’s protons and neutrons come together to form a nuclide, a small amount of mass is converted to energy. 2. An equivalent amount of energy must be added to the nuclide to split apart its protons and neutrons. 3. Statement 1 describes the isotope’s nuclear binding energy, and statement 2 describes the isotope’s mass defect. Which statement is correct?

A0.10 m aqueous solution of sodium sulfate is a better conductor of electricity than a 0.10 m aqueous solution of sodium chloride. which of the following best explains this observation? (a) sodium sulfate is more soluble in water than sodium chloride. (b) sodium sulfate has a higher molar mass than sodium chloride. (c) to prepare a given volume of 0.10 m solution, the mass of sodium sulfate needed is more than twice the mass of sodium chloride needed. (d) more moles of ions are present in a given volume of 0.10 m sodium sulfate than in the same volume of 0.10 m sodium chloride. (e) the degree of dissociation of sodium sulfate in solution is significantly greater than that of sodium chloride.