The “bends” is a medical condition that results from N2 dissolving in the blood when
diving deep underwater and then escaping
and forming bubbles in the blood when the
diver rises to the surface where the pressure is
less. This is best described as an example of
1. Raoult’s Law.
2. Hess’ Law.
3. saturation vapor pressure.
4. minimum boiling azeotrope.
5. Henry’s Law.

Explanation:

"Bends" is caused because the pressure deep underwater is considerably larger thant the atmospheric pressure.

As Henry's Law states, the solubility of a gas in a liquid is proportional to the partial pressure of the gas over the solution: the larger the pressure of the gas, the larger the solubility.

That means that deep underwater, where the pressure is high, more nitrogen gas will be dissolved in the blood of a diver than what can be dissolved on the surface, where the pressure is less.

The nitrogen gas that cannot be dissolved in the blood at lower pressures, when the diver rises to the surface, will form bubbles in the blood that will reach the tissues where they will cause health problems.

Thus, this is an example of Henry's Law: statement 5 from the choices.

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.