−50.4 kJmol−1-50.4 \mathrm{\ kJmol}^{-1}−50.4 kJmol−1
−55.2 kJmol−1-55.2 \mathrm{\ kJmol}^{-1}−55.2 kJmol−1
−57.2 kJmol−1-57.2 \mathrm{\ kJmol}^{-1}−57.2 kJmol−1
−68.6 kJmol−1-68.6 \mathrm{\ kJmol}^{-1}−68.6 kJmol−1