C. Complete the following combustion reaction. Write your balanced equation two different ways. C8H18+O2→
C8H18+O2 →

The substance in reactants side shows a alkane which is burnt. As a result of combustion, Carbon dioxide and water is formed.

The equation will be like this:

Now here we can see that the stoichiometric coefficient is a fraction, hence Multiplying 2 in both sides of the eq.

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%