Calculate the percent composition of the compounds that are formed from these reactions: 1. 9.03 g of Magnesium combine completely with 3.48 g of Nitrogen. 2. 29.0 g of Argon combine completely with 4.30 g of Sulfur. 3. 222.6 g of Sodium combine completely with 77.4 g of Oxygen. Calculate the percent composition of each of the following compounds: 4. C2H6 5. NaHSO4 6. Ca(C2H3O2)2 7. HCN 8. H2O Calculate the mass of the element in the given mass of compound: 9. Mass of Hydrogen in 350 g C2H6 10. Mass of Oxygen in 20.2 g of NaHSO4 11. Mass of Hydrogen in 124 g of Ca(C2H3O2)2 12. Mass of Nitrogen in 378 g HCN