Mass of empty Erlenmeyer Flask (g) 30.46 g Mass of flask 100 ml 10% vinegar (g) 85.56 g Mass of flask 100 ml NaOH (g) 90.23 g Mass of flask after mixing the NaOH with 10% vinegar (g) 175.79 g Mass of the flask after the reaction (g) 145.33 g Temperature of the solution before it is mixed 21.9oC Temperature of the solution after it is mixed 23.1oC 1. Find the combined mass of the two reactions that have taken place. 2. Calculate the combined mass of the contents of the flasks after the reaction has taken place. 3. Finally, calculate the percent deviation within the lab. If the percent deviation was not 0%, what do you think might have happened in the lab that caused it to not be zero? (hint: remember, matter cannot be destroyed).