Pentaborane B 5 H 9 (s) Burns Vigorously in O 2 to Give B 2 O 3 (s) and H 2 O(l)

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Pentaborane B 5 H 9 (s) Burns Vigorously in O 2 to Give B 2 O 3 (s) and H 2 O(l)

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Pentaborane B₅H₉(s) Burns Vigorously in O₂ to Give B₂O₃(s) and H₂O(l)

Question 138

Multiple Choice

Pentaborane B₅H₉(s) burns vigorously in O₂ to give B₂O₃(s) and H₂O(l) . What is ΔH° for the combustion of 1 mol of B₅H₉(s) ? Substance ΔH°_f (kJ/mol)
B₂O₃(s) -1273.5
B₅H₉(s) +73.2
H₂O(l) -285.8

A) -1.5 × 10³ kJ
B) -1.6× 10³ kJ
C) -4.4 × 10³ kJ
D) -4.7× 10³ kJ
E) -9.0× 10³ kJ

Pentaborane B5H9(s) Burns Vigorously in O2 to Give B2O3(s) and H2O(l)

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Pentaborane B₅H₉(s) Burns Vigorously in O₂ to Give B₂O₃(s) and H₂O(l)

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