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The enthalpy of combustion (∆Hc) of aluminum borohydride, Al(BH4)3(l), was measured to be -4138.4 kJ/mol [Rulon...

The enthalpy of combustion (∆Hc) of aluminum borohydride, Al(BH4)3(l), was measured to be -4138.4 kJ/mol [Rulon and Mason, J. Am. Chem. Soc.,73, 5491 (1951)]. The combustion reaction for this compound is given by

Al(BH4)3(l) + 6 O2(g) → ½ Al2O3(s) + 3/2 B2O3(s) + 6 H2O(l)

Given the following additional data, calculate the enthalpy of formation of Al(BH4)3(g).

Substance Property
Al2O3(s) ∆Hf = -1669.8 kJ/mol
B2O3(s) ∆Hf = -1267.8 kJ/mol
H2O(l) ∆Hf = -285.84 kJ/mol
Al(BH4)3(l) ∆Hvap = 30.125 kJ/mol

∆Hf = ___ kJ/mol

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- 343.365 kJ/mol

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