<h3>
Answer:</h3>
- They show the elements of make up a compound
- They show the types of atoms that make up a molecule
- They show the number of each type of atom in a molecule
<h3>
Explanation:</h3>
To answer this question we need to know what is a compound.
- A compound is a substance that is made by two or more atoms of different elements that are chemically combined.
- A chemical formula of a compound is a formula that shows the elements that make up a compound and also the types of atoms that make up the molecule.
- Additionally, the chemical formula shows the number of each type of atom in a molecule.
- In this case, the chemical formula of a molecule of H₂O shows that it is made up of one hydrogen atom and two oxygen atoms.
Answer:
I am not 100% sure but I think it is 26.981538
Explanation:

dissolves in water to give

and

ions according to the following reaction:

-------->

+ 2

So, according to the above reaction, 1 mole of

produce 2 moles of

ion,
So, 0.3 mole will give = 0.3 x 2 = 0.6 moles of

ion
So, Molar concentration =

Note: 1L = 1000mL
I had this question on a test the answer is an exothermic reaction.