Question
Chemistry Question on Thermodynamics
For one mole of NaCl(s) the lattice enthalpy is
A
−788kJ/mol
B
+878kJ/mol
C
+788kJ/mol
D
−878kJ/mol
Answer
−788kJ/mol
Explanation
Solution
Δ/H?=S+D+J.E.+E.A.+U
−411.2=108.4+121+495.6−348.6+U
U=−787.6kJ/mol
=−788kJ/mol