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The compound RX3 decomposes according to the equation
3RX3 → R + R2X3 + 3X2
In an experiment the following data were collected for the decomposition at 100°C. What is the average rate at which RX3 is disappearing over the entire experiment?

t(s) [RX3](mol L–1)

0 0.85

2 0.67

6 0.41

8 0.33

12 0.20

14 0.16