# Need help with Thermochemistry

Dec 4th, 2015
Anonymous
Category:
Science
Price: \$5 USD

Question description

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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