The best explanation would be that Gases were released during the Chemical reaction, causing a loss of Mass.
Answer:
closed container of N2O4 and NO2 is at equilibrium. NO2 is added (increasing the concentration) to the container.
N2O4 (g)
Number 1 do a data table on paper and do as it was said, then go into Microsoft Excel and put your chart in. For 2 make a line graph(as stated) and do what it tells you.For 3 do as said with the line graph or whatever it should look somewhat like a math chart(the coordinate plane) and do as said. For number 4 help him/her study the charts and analyze the difference between the two. And for number 5 make him/her choose one element and research and write down the questions.
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