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What is the numerical ratio of the rate of change in the concentration of CO2 to the rate of change in the concentration of O2? Calculate the pH of a 0.725M solution of nitrous acid, HNO₂.? If a movie starts at 10:45 & is 2hr & 15 min long around what time will it end? Considering the trailers before the movie. Thanks? How you would prepare 275 mL of a 0.58 M NaCl solution from a stock solution of NaCl having a concentration of 1.29 M? A 27.5-kg child is 22.5 m from an 85.5-kg adult. Where is the center of mass of this system? Take the origin at the position of the child.?