The element R is a nonmetal of period 3, with the molecular formula of a gaseous compound with hydrogen of RH2. Element R forms with metal M a compound with the formula MR. Totally burned 46.6 grams of MR, obtained 4.48 liters of RO2 gas (at the location). Find R and M

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.