I am the 1st element in the periodic table
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How much heat is added if 0.814g of water increase in temperature by 0.351 degree c?

Iwould appreciate if someone could me.

Which action would reduce the activation energy of a chemical reaction? a. adding a catalyst to the reaction b. adding more reactants to the reaction vessel c. lowering the potential energy of the products d. lowering the potential energy of the reactants e. raising the temperature of the reaction