please answer 3.4

3.4 Density measurements are often used to determine the type of defects created when impurities are dissolved in ionic crystals. If one assumes that the dissolution of aluminum oxide (Al2O3) in pure magnesium oxide (MgO) creates vacancies on the positive ion lattice, calculate the fractional change in the density of pure MgO when one weight percent of Al2O3 is added to it. 94 Chapter 3/Defects in Solids Assume that the crystal structure and the lattice parameter of MgO do not change with the addition of the alumina