Molar Heat Capacity Molar Heat Capacity(C, unit: energy/mol) Heat needed to increase 1 mol of substance for 1 oC Total heat needed: Q=n(mo)*C*(T -) Under the constant pressure condition>Cp Under the constant volume condition >Cy Molar heat capacity of ideal gases Monatomic molecular gas(e.g. He, Ne, Ar,...) Cy= 3/2R: CD=Cu +r=5 2R Diatomic molecular gas(e.g. H2, O2, HCl,.) CV=5/2R, Cp= Cv+R=7 R 7Molar Heat Capacity  Molar Heat Capacity (C, unit: energy/mol):  Heat needed to increase 1 mol of substance for 1 oC.  Total heat needed: Q = n (mol) * C * (Tfinal – Tinitial)  Under the constant pressure condition  CP  Under the constant volume condition  CV  Molar heat capacity of ideal gases:  Monatomic molecular gas (e.g. He, Ne, Ar, …):  CV = 3/2 R; CP = CV + R = 5/2 R  Diatomic molecular gas (e.g. H2 , O2 , HCl, …):  CV = 5/2 R; CP = CV + R = 7/2 R 7