{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

3b - The Enthalpy Properties H=U PV The enthalpy is a state...

Info icon This preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 The Enthalpy H=U+PV Properties • The enthalpy is a state function - since its constituents U, P and V are. • The enthalpy is an extensive property ( ) – because U ad V are H > U – since PV>0. For a reversible process at constant pressure ( ), in a system that only allows expansion work, the enthalpy change is equal to the heat exchange: • The enthalpy change upon heating a material at constant pressure: ex P P = ( ) f i f f i i f i f i H H H U PV U PV U U P V V U P V U w q = = + = + = ∆ + = ∆ = T p q H c = ∆ = / H H n = Endothermic process: 0 ; exothermic process: 0 H H > <
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon