In the balanced redox reaction 2 al(s) 6 hcl(aq) → 2 alcl3(aq) 3 h2(
g. 80.0 ml of 2.0 m hcl would (theoretically) react with how many grams of al(s)? assume that the reaction is quantitative.
a. 1.44 g
b. 4.32 g
c. 1,440 g
d. 2,030 g
e. none of the above

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%