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the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.

1. they vary with a higher number because boiling is way hotter than melting

can you attach the

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.