Author Question: Calculate the energy change for the formation of CaF2(s) from its elements in their standard states ... (Read 40 times)

sheilaspns · **on:** Feb 15, 2020

Question 1

Calculate the lattice energy for MgCl2(s) using a Born-Haber cycle and the following information:

MgCl2(s) → Mg2+(g) + 2 Cl-(g)

?

Mg(s) + Cl2(g) → MgCl2(s)

-641.6 kJ/mol

Mg(s) → Mg(g)

+147.1 kJ/mol

Mg(g) → Mg+(g) + e-

+737.8 kJ/mol

Mg+(g) → Mg2+(g) + e-

+1451.0 kJ/mol

1/2 Cl2(g) → Cl(g)

+121.7 kJ/mol

Cl(g) + e- → Cl-(g)

-348.6 kJ/mol

◦ +2523.7 kJ/mol
◦ +1882.1 kJ/mol
◦ +641.6 kJ/mol
◦ +1240.5 kJ/mol

Question 2

Calculate the energy change for the formation of CaF2(s) from its elements in their standard states and the following information:

Ca(s) + F2(g) → CaF2(s)

?

Ca(s) → Ca(g)

+179.3 kJ/mol

Ca(g) → Ca+(g) + e-

+589.9 kJ/mol

Ca+(g) → Ca2+(g) + e-

+1145 kJ/mol

1/2 F2(g) → F(g)

+79.0 kJ/mol

F(g) + e- → F-(g)

-328.0 kJ/mol

CaF2(s) → Ca2+(g) + 2 F-(g)

+2630 kJ/mol

◦ -1214 kJ/mol
◦ -965 kJ/mol
◦ +4046 kJ/mol
◦ -3286 kJ/mol

gasdhashg · **Reply #1 on:** Feb 15, 2020

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