Which of the following is correct concerning hess's law?
a. the change of enthalpy of a reaction can be found be subtracting the enthalpy of the products from the enthalpy of the reactants.
b. the change in enthalpy can be found be subtracting the enthalpy of the reactants from the enthalpy of the products.
c. the change in enthalpy can be found by adding the enthalpies of the individual thermochemical reactions of a chemical reaction.
d. the change in enthalpy can be found by subtracting the enthalpies of the individual thermochemical reactions of a chemical reaction.

adding or remove a gaseous reactant or product changes the concentrations. if the concentration of reactant or product is increased, the system will shift away from the side in which concentration was increased (i.e. if the concentration of reactants is increased, the system will shift toward the products. if more products are added, the system will shift to form more reactants). conversely, if the concentration of reactant or product is decreased, the system will shift toward the side in which concentration was decreased (i.e. if reactants are removed, the system will shift to form more reactants. if the concentration of products is decreased, the equilibrium will shift toward the products).

explanation:

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