When a sequence of thermochemical equations is combined to obtain the enthalpy change…
CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics
Problem
When a sequence of thermochemical equations is combined to obtain the enthalpy change for an unknown reaction, which statement best describes the relationship between the step enthalpies and the enthalpy of the target reaction?
(a) The enthalpy change of the target reaction equals the arithmetic mean of the individual step enthalpy changes.
(b) The enthalpy change of the target reaction equals the sum of the absolute values of the individual step enthalpy changes.
(c) The enthalpy change of the target reaction equals the algebraic sum of the enthalpy changes of the individual steps.
(d) The enthalpy change of the target reaction equals the enthalpy change of the slowest (rate-determining) step in the sequence.