Which statement most strongly justifies why the numerical value of scales in direct…
CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics
Problem
Which statement most strongly justifies why the numerical value of ΔH scales in direct proportion to the amount of substance represented by the coefficients of a chemical equation?
(a) Because enthalpy is an intensive property that does not depend on the quantity of substance, ΔH stays the same when the equation is multiplied.
(b) Because Hess’s law applies only when two or more different reactions are added, multiplying a single reaction by a factor does not alter its ΔH.
(c) Because enthalpy is a state function, its value depends only on initial and final states, so doubling the moles doubles the energy change.
(d) Because energy must be conserved, increasing the number of moles requires dividing ΔH by the same factor so the total energy of the system remains constant.