The equilibrium constant, Kc, for the following reaction is 6.50×10-3 at 298 K. 2NOBr(g) ⇌ 2NO(g) + Br2(g)

If an equilibrium mixture of the three gases in a 18.5 L container at 298 K contains 0.466 mol of NOBr(g) and 0.279 mol of NO, the equilibrium concentration of Br2 is
M.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

може ли да зареждате повече информация, моля

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.