Calculate the number of molecules in 6.00 moles H2S?

There are 3.612×10^24 Molecules in total.

Explanation:

Mole number: 6.02214179×10^23

There are 6.0 moles of H2S molecules.

Therefore, there are 3.612×10^24 Molecules in total.

(are you sure that the question wasn't asking for the number of atoms?)

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%

the answer is 75.0%.