Car wax mostly contains beeswax and carnauba wax. these large hydrocarbons are ideal to use because they water. a) absorb b) contain c) incorporate d) repel

D) repel

Explanation:

Car wax is particularly used after car washing and polishing. This will allow the addition of a layer of shine to the car. The composition of beeswax and carnauba wax are the two additives which are included in the car wax. This composition is hydrophobic in nature which means the wax components will not mix with water or any other solvent and will help in retaining the shine over the body of car.

On the basis of the above explanation, the wax components will repel water.

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%