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Pentaborane B5H9(s) burns vigorously in O2 to give B2O3(s) and H2O(l).  What is Δ for the combustion of 1 mol of B5H9(s)?

Substance                                    Δf (kJ/mol)

B2O3(s)–1273.5

B5H9(s)                                        +73.2

H2O(l)                                          –285.8



▸ –1486.1 kJ

▸ –1632.5 kJ

▸ –4396.7 kJ

▸ –4543.1 kJ

▸ –9086.1 kJ
Textbook 
Chemistry: Atoms First

Chemistry: Atoms First


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