Final answer:
The measure of the total kinetic energy of the gas particles in the cylinder is best described by the temperature of the mixture of gaseous reactants.
Step-by-step explanation:
The measure of the total kinetic energy of the gas particles in the cylinder is best described by the temperature of the mixture of gaseous reactants. Increasing temperature increases the average kinetic energy and velocity of the gas molecules, resulting in more frequent and forceful collisions, which in turn leads to an increased gas pressure. Therefore, the temperature is directly related to the total kinetic energy of the gas particles.