7. How many grams are in 2.75 moles of dinitrogen trioxide, N2

8. How many moles are in 25.8 grams of calcium phosphate, Ca3(PO4)2?

9. Determine the mass, in grams, of 2.51 x 1024of dinitrogen trioxide, N2O3

10. How many atoms are in a sample of Ca3 mass of 82.47 grams?

11. How many liters are in 4.99 moles of oxygen?

Find the percentage composition for the following compound:
12.sulfuric acid, H2SO4

Calculate the empirical formula for the following compound:
13. 32.4%, sodium, 22.5% sulfur, and 45.15% oxygen

Find the molecular formula for the following compound:
14. The compound has an empirical formula of CH2
and its molecular mass is 70.0 g/mol.