Calculate the weighted average atomic mass for this unknown element with three isotopes: X-44 with a mass of 43.955 amu and a relative abundance of 2.1%, X-
40 with a mass of 39.963 amu and a relative abundance of 96.9%, X-42 with a
mass of 41.959 amu and a relative abundance of 0.7%. Identify the unknown
element based upon the weighted average atomic mass.

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.