Element magnesium (Mg) contains three isotopes: 24Mg (23.9850 amu) 25Mg (24.9858 amu) and 26Mg (25.9826 amu). If the abundance of 24Mg is 78.99%, and the average atomic mass of Mg is 24.3050 amu, the abundance of 26Mg should be ___%. (Please keep four sig figs in your result).

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?