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    Chemistry Study Set 8
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    Exam 5: Thermochemistry
  5. Question
    Pentaborane B<sub>5</sub>H<sub>9</sub>(s) Burns Vigorously in O<sub>2</sub> to Give B<sub>2</sub>O<sub>3</sub>(s) and H<sub>2</sub>O(l)
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Pentaborane B5H9(s) Burns Vigorously in O2 to Give B2O3(s) and H2O(l)

Question 110

Question 110

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) -1486.1 kJ
B) -1632.5 kJ
C) -4396.7 kJ
D) -4652.85 kJ
E) -9086.1 kJ

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