One kind of potential energy is elastic potential energy. this is the kind of energy present in a rubber band that is stretched. when the rubber band is released, the elastic potential energy is converted to kinetic energy. elastic potential energy is also present in a muscle that is contracted, or tensed.

the diaphragm is a large muscle that is used to breathe. contracting the diaphragm causes air to move into the lungs. when the diaphragm is relaxed, air moves out of the lungs as is converted to kinetic energy.
a.
chemical potential energy
b.
light energy
c.
elastic potential energy
d.
heat energy

C.  Elastic potential energy

Explanation:

Hello,

In this case, as well as the example of the rubber, when we breath, the diaphragm is contracted so the elastic potential energy is starting accumulating there, that is why we could hold the air into our lungs. Consequently, when air is released such energy in converted into kinetic energy since it was previously formed and then released.

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answer: the enthalpy of the overall chemical reaction is +87.88 kj or +88 kj.

according to hess's law, the overall enthalpy of a reaction is the difference between the sum of enthalpy values of all the products and the sum of enthalpy values of all the reactants.

δh(reaction) = ∑nδh(products) - ∑nδh(reactants)

δh(reaction) = [δh +δh] - [δh]

δh(reaction) = [1(-287.02) + 1(0) ] - [1(-374.9)] kj = +87.88 kj

here, δh (pcl3) = -287.02 kj, δh(cl2) = 0, δh(pcl5) = -374.9 kj

therefore, enthalpy of the overall reaction is +87.88 kj or +88 kj.

answer; i do believe the correct answer is (river); /// good luck