1.- Calculate the latice energy of magnesium sulfidefrom the following data: Mg(

Question

1.- Calculate the latice energy of magnesium sulfidefrom the following data: Mg(s) ----> Mg(g) + Ho= 148 kJ/mol Mg(g) ----> Mg2+(g) + 2e- Ho= 2186 kJ/mol S8(s) -----> 8S(g) Ho=2232 kJ/mol S(g) + 2e- --->S2-(g)   Ho= 450 kJ/mol 8Mg(s) + S8(s) --->8MgS(s)  Hof= -2744kJ/mol possible answers: a) -3406 kJ/mol    b) -2720kJ/mol    c) 2720 kJ/mol    d) 3406kJ/mol   e) none of the answers. 1.- Calculate the latice energy of magnesium sulfidefrom the following data: Mg(s) ----> Mg(g) + Ho= 148 kJ/mol Mg(g) ----> Mg2+(g) + 2e- Ho= 2186 kJ/mol S8(s) -----> 8S(g) Ho=2232 kJ/mol S(g) + 2e- --->S2-(g)   Ho= 450 kJ/mol 8Mg(s) + S8(s) --->8MgS(s)  Hof= -2744kJ/mol possible answers: a) -3406 kJ/mol    b) -2720kJ/mol    c) 2720 kJ/mol    d) 3406kJ/mol   e) none of the answers.

Explanation / Answer

Mg(g) ---->Mg(s)                     Ho= -148 kJ/mol Mg2+(g) + 2e- ----> Mg(g)       Ho= -2186 kJ/mol S(g) ----->(1/8)S8(s)                Ho= -2232/8 kJ/mol S2-(g) ---> S(g) +2e-                Ho= +450 kJ/mol Mg2+ (g)    + 2S2-(g)-> MgS(s)

Hlattice = (-2744 kJ/mol)/8 + (-148 kJ/mol) -2186 kJ/mol-2232/8 kJ/mol +450 kJ/mol
Hlattice = -2506 kJ/mol

E)
Mg(g) ---->Mg(s)                     Ho= -148 kJ/mol Mg2+(g) + 2e- ----> Mg(g)       Ho= -2186 kJ/mol S(g) ----->(1/8)S8(s)                Ho= -2232/8 kJ/mol S2-(g) ---> S(g) +2e-                Ho= +450 kJ/mol

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