The relationship between the Kelvin temperature and volume of a gas is linear until the temperature begins to approach 0 K. why?

See explanation

Explanation:

We must remember that gases exhibit ideal gas behavior at ordinary temperature and pressure.

As the system approaches absolute zero gas laws begin to break down and the relationship linear  between volume and temperature (Charles law is broken).

Recall that, at absolute zero, the volume of an ideal gas would be zero and all molecular motion stops due to the fall in temperature and kinetic energy of the molecules.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.