Question

Which thermo chemical process is shown by the following figure?

• A. Standard enthalpy of a reaction
• B. Born – Haber cycle of lattice enthalpy
• C. Hess’s law of constant heat summation
• D. Standard enthalpy of a solution.

Answer 1

Answer: (C)

Hess’s law of constant heat summation

Answer 2

: $X\overset{\quad\Delta H_{1}\quad}{\rightarrow}Y$

$X\overset{\quad\Delta H_{1}\quad}{\rightarrow}P\overset{\quad\Delta H_{2}\quad}{\rightarrow}Q\overset{\quad\Delta H_{3}\quad}{\rightarrow}Y$

$\Delta H = \Delta H_{1} + \Delta H_{2} + \Delta H_{3}$