+60 KJmol−1+60 \ \mathrm{KJmol}^{-1}+60 KJmol−1
+6 KJmol−1+6 \ \mathrm{KJmol}^{-1}+6 KJmol−1
−60 KJmol−1-60 \ \mathrm{KJmol}^{-1}−60 KJmol−1
−6 KJmol−1-6 \ \mathrm{KJmol}^{-1}−6 KJmol−1