University:
The Pennsylvania State University
Course:
CHE 220 | Introduction to Chemical Engineering Thermodynamics
Academic year:

2020
Views:

368

Pages:

10
Author:

study_genius

Topics for Today * Nomenclature ¢ Definitions System / surroundings - State - - * : with plane properties the thermodynamic Extensive / Working Reading $ intensive units Sections 1.3 - t5 Basic Definitions * System Objatofcalalation : * Surroundings * Universe Sur interact exchange of of matter , unit , plant ) UNN else @T vin sur : mass (m ) * heat (a) * Work (W) * amount Systsnr : * System & Everything : ( Classification Open - - - - of Systems ( exchange , Closed ( dues not mass ) exchange mass ) Diathermal ( exchanges heat ) Atiabatic ( does hoi exchange QI Isolated : No exchange of any kink SYSTEM J Q¥aa oµf÷e¥in÷texH÷÷vI± flow process open * It is up * Once the Open or ~D to us define the system to system is defined , we must Closed We will begin With closed systems Will introduce systems in oh open * Simplest system with determine it it a : a fixed simple system amount in 6 of mind matter . . . . is State : Properly The state : Extensive nything we e.g. density , T, ( and P , heat capacity Intensive Properties eg of : : . independent of amount state . to the total , . ] position ) am @ fixed measure can Properties : proportional , ratio Definition fixed by is e.g. tral Volume Thr More amount of energy , amount BT, density heat capacity , . . . . . . . , two extensive properties is an intensive property . Specific Specific Molar : An EXAMPLE specific vo ' = cmf 1molar = Vol . per mass Unit mole water aooi Yj36YTg= = = Fifa ' expressed unit 18g , Euston Molar density . lmol ; is of Vol 18*56 mmlo Egg ? ' - 3 ¥3.1 = = molar & V= 1cm 1g mdarrol MAH Density Specific : Properties expressed per is Anextensive properly that : M= properly that extensive Molar & H*Nmm÷ . , 5.55*106 mot his , Yes Nomenclature Etensive Properties Intensive Properly : : eg . Vtot volume e.g. V Vol . them V=¥t : I ' or Tmf Example : : Molar Mass of water mass = = En amass Specific Nteonmdarmns ) V= of lmol HI molar . -18×18311 , Moi ÷ perstunit On The SI is highly into anything else Basic SI Force Work You can always kg : : Joule Meter Simple Relationships CN) Fema ( J) 1 ( Nt on ) p=Fop÷a lcPa)= ... convert the final result . Newton : length . Units : Mass recommended Units but 1Pa is too small so : 1 ( kg ) . 1¥, 11mg latm = 105Pa = = unbar 0.981 1.013bar atm ( approximately , lbaklatm N . ktm Pa='¥- Kmt , 1bar ) ) No Excuse for UNIT errors !! ! http://www.cnn.com/TECH/ space/9909/30/mars.metric.02/ Ohtemperatnre SI : Kelvin ( absolute ) T No Excuse for HNIT Te= €+273.15 E- -⇐ 341 EXAMPLE : Convert 80°F errors http://www.cnn.com/TECH/ space/9909/30/mars.metric.02/ , , into , Kelvin -32%8=26.67 ÷=#g* ->t= +273.15=299.82 ~> §l=2ljbYd !! ! 26.67°C T= 299.82k EXAMPLE Theheatcapaaityofchloroformis CPI 19.8 -1022T - ( Jtnolk 0.000267 X ) EQL Kelvin Obtainanequationthattakelinf SOLUTION #+az( E) C#ao+a : ' )~pcp= , J/mol¥ a=ts( ¥ -33+2>3.15 58.47 Application : +0.0469¥ -1--3001<=80 .3F to Eat I motk EQ :Z . Exercise ¥ L 9=61.75 0.0000807€ )2 - Notify 't gireq 61.75£ mo ' .K , Equation I 8°C to