Calculate the electron affinity for the formation of the hydride ...

[genevieve1028]

Question 1

Calculate the energy change for the formation of MgBr2(s) from its elements in their standard states:

Mg(s) + Br2(l) → MgBr2(s)

?

Mg(s) → Mg(g)

+147.1 kJ/mol

Mg(g) → Mg+(g) + e-

+737.8 kJ/mol

Mg+(g) → Mg2+(g) + e-

+1451 kJ/mol

Br2(l) → Br2(g)

+30.9 kJ/mol

1/2 Br2(g) → Br(g)

+112.0 kJ/mol

Br(g) + e- → Br-(g)

-325.0 kJ/mol

MgBr2(s) → Mg2+(g) + 2Br-(g)

+2440 kJ/mol

◦ -499.2 kJ/mol
◦ -150.8 kJ/mol
◦ -5682 kJ/mol
◦ -286.0 kJ/mol

Question 2

Calculate the electron affinity for the formation of the hydride ion from the following information:

H(g) + e- → H-(g)

?

1/2 H2(g) → H(g)

+217.9 kJ/mol

Na(s) → Na(g)

+107.3 kJ/mol

Na(g) → Na+(g) + e-

+495.8 kJ/mol

Na(s) + 1/2 H2(g) → NaH(s)

-60.0 kJ/mol

NaH(s) → Na+(g) + H-(g)

+810.9 kJ/mol

◦ -1632 kJ/mol
◦ -70.1 kJ/mol
◦ -50.1 kJ/mol
◦ -816 kJ/mol

[ryansturges]

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[Kei Hari]

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