In a steady-state flow process carried out at atmospheric pressure, 1 mol/s of air at 600 K (stream A) is continuously mixed with 3 mol/s of air at 440 K (stream B). The product stream is at 400 K and 1 atm (stream C). Assume that the surroundings are at 305 K, and that kinetic- and potential-energy changes of the streams are negligible. Air is assumed an ideal gas, with constant heat capacity, consisting of diatomic molecules (Cp=7/2 R). Calculate the rate of heat transfer (J/s) of the process, the rate of entropy generation (J/(s*K)) and lost work (J/s) for the process. Sketch a schematic representation of the process, including streams’ temperatures and flowrates. Start solving your problem by writing and simplifying the mass, energy and entropy balance for the process.

if you're asking what comes out, it's steam.

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.