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Chemistry LibreTexts

Enthalpy 1 (Worksheets)

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Work in groups on these problems. You should try to answer the questions without referring to your textbook. If you get stuck, try asking another group for help.

Q1

Using bond energies, calculate the \(\Delta H_{rxn}\) for each of the following:

  1. \(2H_{2\,(g)} + O_{2\,(g)} \rightarrow 2H_2O_{(l)}\)
  2. \(CH_{4\,(g)} + 2O_{2\,(g)} \rightarrow CO_{2\,(g)} + 2H_2O_{(l)}\)

 
 

Bond type
Bond Energy, kJ/mol
Bond type
Bond Energy, kJ/mol
\(H - H\)
436
\(C - O\)
358
\(O - O\)
146
\(C = O\)
799
\(O = O\)
498
\(C - H\)
413
\(O - H\)
463