CHEM 121 Lecture 13: 66Lecture 13.pdf
19 Jun 2013
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Energy and enthalpy of heating a gas (cid:96) at constant volume: qv = ncv t (cv = 3/2 r) E = cv t per mole or e = nc v t for n moles. For any ideal gas the change in internal energy is ncv t. Energy and enthalpy of heating a gas (cont"d) (cid:96) at constant pressure: qp = ncp t. E = qp + w = qp - p v qp = e + p v. E for an ideal gas depends only on t (not on p or v) T when an ideal gas is heated whether at. E = nc v since pv = nrt then: h = e + (nrt) H = e + (pv) and e = ncv t then: h = ncv t + nr t since cp = cv+ r. H = nc p t for constant volume or constant pressure.
