Question

Use the born-haber cycle to calculate the standard enthalpy of formation for SRI2 (strontium iodide)

Answer 1

Answer:

Born-Haber Process - "Born-Haber process applies Hess's law to calculate the lattice enthalpy(this is a thermodynamic term which equals to the total heat content of a system), by comparing the standard enthalpy change of formation of ionic compound (from the elements) to the enthalpy required to make gaseous ions from the elements".

Explanation:

Now the calculations done for SRI2 are as follows:

• Enthalpy of Sublimation of Sr(s)= 164 kJ per mol,
• 1st ionization energy of Sr(g)=549 kJ per mol,
• 2nd ionization energy of Sr(g)=1064 kJ per mol,
• Enthalpy dissociation energy of I2(s)= 62.4 kJ per mol,
• Bond dissociation energy of I2(g)= 152.55 kJ per mol,
• 1st electron affinity of I(g)= -295.15 kJ per mol,
• Lattice energy of SrI2(s)=-1959.75 kJ per mol.

Note - the terms mentioned in the brackets are as, S- solid form, g- Gaseous form.