Hf is a stronger acid than nh+ 4 . which base would be stronger: f− or nh3? 1. f − 2. both bases would be equal in strength. 3. nh3 4. cannot tell from the information given. 5. neither f1− nor nh3 would be bases.

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%