Draw the structure of the acyclic alkane(s) that have 8 carbons and only primary hydrogens.

Alkanes are organic compounds made up of carbon and hydrogen only and all carbon-carbon bonds are  single bonds in alkane.  Alkanes that does not possess ring-structure are acyclic alkanes. The general formula of alkanes is where n is number of carbon atoms.

Hydrogens that are bonded to primary carbon that is a carbon which is bonded only to one carbon atom is known as primary hydrogen.

The structure of the acyclic alkane(s) that have 8 carbons and only primary hydrogens is shown in the image.

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.