Hi, Can anyone explain me that in chemical kinetics, the rate of reaction can be determined by just determining the rate of any reactant of product involved in the reaction, but how? How the rate of change of concentration of just one specie can tell you about the whole reaction? I found the example of fermentation of sucrose at a site and I couldn't understand this point: " The coefficients show us that the reaction produces four molecules of ethanol and four molecules of carbon dioxide for every one molecule of sucrose consumed. As before, we can find the reaction rate by looking at the change in the concentration of any reactant or product. In this particular case, however, a chemist would probably use the concentration of either sucrose or ethanol because gases are usually measured as volumes and, the volume of CO2gas formed will depend on the total volume of the solution being studied and the solubility of the gas in the solution, not just the concentration of sucrose." I can't understand the CO2 point, how Co2 volume depends on volume of solution and why ignoring it wouldn't affect the rate determination?