Question

2 B5H9(l)+12 O2(g)---->5 B2O3(s)+9 H2O(l)

Calculate the kilojoules of heat released per gram (kJ/g) of the compound reacted with oxygen. The standard enthalpy of formations of B5H9(l), B2O3(s), and H2O(l) are 42.84, -1271.94, and -285.83 kJ/mol, respectively.

Answer 1

delta Hrxn = (n*sum delta H products)-(n*sum delta H reactants)