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Unformatted text preview: Quizsm P [1033a]
i 9 Three moles of a monoatomic ideal gas go through the isothermal process shown on the PV diagram to the right. f
T4 : a»: r 3 e m mm \ 3x83: C " x a vm'ﬁﬁ K 2 Siutgxgoﬂmiad 1‘ l (a) Which one of the following statements is always true when you have an ideal gas undergoing an isother—
mal process? Brieﬂy motivate your answer.
i. AU = 0
ii. Q = U
EL}; MC-VI'ST 01/“q [3110 -—:J) M:O First three letters of your
famin name C .
‘>l'~\iC EL'LVt Sawmd &.fPJKU%LJ (b) Find the change in internal energ, heat. and work for this process. BU :LHNBT : 3x €thdldt3i : w= - ‘ i’e’ -* V ~ (i I];
v»: -gkow — —\um¢%; -tuhlurf 1&5“ququ
+36%” ((3) Find the change in entropy of the gas during the process As: L53. ; Sal/[53: “>355 1:7 +23%
T T mutt &' —-\)\1i: gait/(3LT PLEASE TURN PAGE 2. Suppose you mix 2kg of water at 100°C with 23:79 of water at 0°C and wait until the mixture reaches thermal
equilibrium. (a) What is the ﬁnal equilibrium temperature of the mixture? 3“ 1‘,o‘i)
r 214%, X Althssj x (T13 — Loo”Ll _
[Li/u :0 : (b) Find the change in entropy of the water that was initially at 100°C. A g lac"( MACS in if : iLCé’KCLWKiJ: \ \ (c) Find the change in entropj,r of the of water that was initially at 0°C. 3;
SJ LM(511"T_iZ 2 ZLA/K‘tlgw
II K (d) Find the total change in entropy. Is the process spontaneous or not? II 93L gut
‘7 : DIS-.13.: You might need: AU 2 Q + W
R _ 831de
Na 2 6.0 x 10231313”
pV = nRT
. _ 723 J
tb _ 1.3220): 10 atmx
AS = f T - AS = % <— for a isothermal transformation
AS = f 4—ch‘17' = mes ln(%) ‘W : i f pdV : —nRTln(%) <— for a gas undergoing an isothermal transformation ...
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