1. What is the atomic weight of metal M if a sample of metal oxide (0.4150g) with the formula M2O3 is quantitatively converted to metal sulfide, MS, yielding 0.4570g?
2. What is the percent by mass Na2SO4 10H20 in the resulting mixture of anhydrous salt and hydrate? A thoroughly dry sample of Na2SO4 (1.0000 g) is exposed to the atmosphere for a period of time and is observed to have gained0.4250g.
F. wt. Na2SO4 10H20 =322.07
F. wt. Na2SO4 =141.92