A rigid container of oxygen has a pressure of 3.5 atm and a temp of 713K, what is the pressure at 273K?

Explanation:

This is most easily solved using Gay-Lussac's Law, which relates temperature and pressure as follows:

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a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.