diff --git a/include/cantera/thermo/StoichSubstance.h b/include/cantera/thermo/StoichSubstance.h
index 61ca930e8..a1c986308 100644
--- a/include/cantera/thermo/StoichSubstance.h
+++ b/include/cantera/thermo/StoichSubstance.h
@@ -224,6 +224,21 @@ public:
      */
     virtual void getPartialMolarEntropies(doublereal* sbar) const;
 
+    //! Get the species partial molar enthalpies. Units: J/kmol.
+    /*!
+     * @param ubar    Output vector of species partial molar internal energies.
+     *                Length = m_kk. units are J/kmol.
+     */
+    virtual void getPartialMolarIntEnergies(doublereal* ubar) const;
+
+    //! Get the partial molar heat capacities Units: J/kmol/K
+    /*!
+     * @param cpbar   Output vector of species partial molar heat capacities
+     *                at constant pressure.
+     *                Length = m_kk. units are J/kmol/K.
+     */
+    virtual void getPartialMolarCp(doublereal* cpbar) const;
+
     /**
      * returns an array of partial molar volumes of the species
      * in the solution. Units: m^3 kmol-1.
diff --git a/src/thermo/StoichSubstance.cpp b/src/thermo/StoichSubstance.cpp
index d5c443967..14e9d002f 100644
--- a/src/thermo/StoichSubstance.cpp
+++ b/src/thermo/StoichSubstance.cpp
@@ -169,6 +169,16 @@ void StoichSubstance::getPartialMolarEntropies(doublereal* sbar) const
     sbar[0] = entropy_mole();
 }
 
+void StoichSubstance::getPartialMolarIntEnergies(doublereal* ubar) const
+{
+    ubar[0] = intEnergy_mole();
+}
+
+void StoichSubstance::getPartialMolarCp(doublereal *cpbar) const
+{
+    cpbar[0] = cp_mole();
+}
+
 void StoichSubstance::getPartialMolarVolumes(doublereal* vbar) const
 {
     vbar[0] = 1.0 / molarDensity();