Part a
chachachch, co k+
ch, ch
spell out the full name of the compound.

potassium 3-ethylpentanoate

or

potassium 3-ethylpentanoic acid

Explanation:

This is an organic compound.

This is a salt of carboxylic acid

This compound have 5 carbon main chain

There is an ethyl group is attached on carbon 3

K (Potassium) substituted the H (hydrogen) of pentanoic acid and form salt of it.

This compound shown in ionic form as salt solution written in ionic form.

So,

the name will be

Potassium 3-ethylpentanoate

it is also named as potassium 3-ethylpentanoic acid

Note: you can write any one of them both are right

the structure and name is given in attachment