For the chemical c2 h6- c2 h4+h2+137kj, the chemical energy of the

Hi!

In this reaction, the chemical energy of of the products ( C2H4 & H2 ) are greater than the chemical energy of the reactant ( C2H6 ).

We can see this by the value of the change of enthalpy in the system which in this given reaction is +137 kJ.

The positive enthalpy change indicates that the energy invested in the reaction is more than the energy released, which means that the system has absorbed energy. This is often translated as the products being at a higher level of energy as compared to the products.

This is an example of an endothermic reaction, and you can develop a better understanding by referring to the attached picture.

Hope this helps!

b. acid is the correct answer @jayxboof all social media

acid : acids are those which accepts an electron-pairs.

base : bases are those which donates ab electron-pairs.

alkali : it is a base that dissolves in water. it is basically a base and the ph greater than 7.

hydroxide ion : it is a poly-atomic ion which is negatively charged.

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%