4. What number of anions is present in 1.11 g of calcium chloride? Given : M(Ca) = 40 g/mol M(CI) = 35.5 g/mol Avogadro's number 6x10^23*
(3 Points)
0 0.02
2.4 x 1022
0 2.4 x 1023
O 1.2 x 1022

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%