FIGURE19-12ProcessADBconsists of an isochoric (AD)and anisobaric(DB)process.PnRTea(%)IsothermalW=0BIsobaricPBDW= Pg (Vg-V)=nR(-0VBd=
U=CQ",=FIGURE19-13Freeexpansion
?Molar Specific Heats·Q=nCy△T(Cy=mcy/ n)·Q=nCp△ T(Cp=mcp/n)
•Molar Specific Heats •Q=nCv⊿T (Cv=mcv/n) •Q=nCp⊿T (Cp=mcp/n)
TABLE 19-3Specific heats of gases at 15°CSpecificheatsMolar specificheats(kcal/kg.K)(cal/mol·K)Cp-CyCpYGasCyCpCvCp(cal/mol·K)CvMonatomicHe0.751.152.984.971.991.67Ne0.1482.980.2464.971.991.67DiatomicN20.1770.2484.966.951.991.40020.1550.2185.037.032.001.40TriatomicCO20.1530.1996.808.832.031.30H,0 (100°C)0.3500.4826.208.202.001.32PolyatomicCH.0.3430.41210.3012.352.051.20