Ameasure of how much mass there is in a volume of a substance is

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The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?

The footprints of a dinosaur and the burrow of an ancient shrimp are examples of which kind of fossils