Element compound homogeneous mixture (heterogeneous mixture) 4) A piece of gold has a mass of 49.75 g. What should the volume be if it is pure gold? Gold has a density of 19.3 g/cm (3 points) D=m/v 19.32g/cm^3=7/49.75g 5) How many protons, electrons, and neutrons are present in an atom of Ca? 2041 (3 points)