This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
ScanSolve AI Answer
The question asks to identify the enthalpy change ( H) values corresponding to three specific energy changes involved in the formation of sodium chloride (NaCl). These values are typically part of a Born-Haber cycle, which is used to calculate lattice energy. Heat of formation: This is the enthalpy change when one mole of a compound is formed from its constituent elements in their standard states. For NaCl, this is the formation from solid sodium (Na_(s)) and chlorine gas (Cl_2(g)). The value -410 represents the overall energy released when NaCl is formed. Atomization energy: This is the enthalpy change required to produce one mole of gaseous atoms from an element in its standard state. For chlorine, it's the energy needed to break the Cl-Cl bond in Cl_2(g) to form individual gaseous chlorine atoms (Cl_(g)). The value +121 is positive because energy is absorbed to break bonds. Sublimation energy: This is the enthalpy change required to convert one mole of a solid directly into a gas. For sodium, it's the energy needed to change solid sodium (Na_(s)) into gaseous sodium atoms (Na_(g)). The value +108 is positive because energy is absorbed to overcome intermolecular forces and change state. That's 2 down. 3 left today — send the next one.