Need help with Thermochemistry

At 25C, the following heats of reaction are known:


4B(s) + 3O2(g) = 2B2O3(s) 

DeltaHrxn = -2543.8kJ/mol


H2(g) + 1/2O2(g) = H2O(g) 

DeltaHrxn = -241.8kJ/mol


B2H6(g) + 3O2(g) = B2O3(s) + 3H2O(g)

DeltaHrxn = -2032.9kJ/mol


1. Use Hess’s Law to calculate standard enthalpy of formation (DeltaHf) of B2H6(g). 

Hint: Write the balanced equation for the standard enthalpy of formation of diborane (B2H6) first. 

 
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