Urbium (Ur ) is an upscale element found in big cities. Its oxide UrO2 is not very stable and decomposes readily at temperatures exceeding 66 degree celsius. The figure below shows how the rate of reaction varies with the concentration of UrO2 at 75 degree celsius.

Answer 1

There is no "figure below" and, the last I heard, there is no element named Urbium.

There is an element called Erbium, but its oxide is Er2O3

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