**Unformatted text preview: **Chemistry 230 -— Quiz 3
September 19, 2001 — Tellinghuisen KEY Note: If you want your paper returned folded (i.e., score concealed), please print your name on the back. Pledge and signature: 1. (5) A mole of He gas initially at 155°C and 1.11 atm undergoes a cyclic process for which q = 129 J.
- Determine as many of the following as possible: AU, AH, AP, AT, w. » = 1 = . = .— = —| a:
All .— AH DP AT 0 ) W 3’ «l
2. (5) Brieﬂy describe a possible process for taking liquid water from 25°C and 1.0 atm to 30°C and 1.0
atm,withq<0. _
Ffm‘l’ wol Mmiwmbtl‘(ﬁ<0). Wool»
34%ng mark in bvﬁmg +0 3202, (3:0, w>o). 3. (7) A hypothetical substance obeys the equation of state PVﬂr1 = BT, where B is a constant. The
substance undergoes a change of state from (T1, V1) to (T2, V2), along a path where T varies quadratically with V, in accord with T = c1V2 + (:2 (where C] and c2 are constants). Calculate the work
w in terms of B, cl, c2, V1, V2, and the number of moles n. U2.
to: — 3:" PM 3P= 93f “LL “1%[c.vi+cz.]
U L
w: , 4M2) [C'Svfwu + C18: 9%] =-%B [Cr y; + 62.0“" iv! ]= “Mir“:- (U(Z~VLZ}+cJa%] 4. (10) Suppose that the thermal expansivity of ethanol can be expressed as a = a + b8 over the Celsius temperature range 0 S 6‘ 5 400°C, where a and b are constants. Further suppose that an ethanol
thermometer has been calibrated to be correct at 00°C and at 400°C. Obtain an expression (in terms of the constants a and b) for the apparent temperature on this thermometer when the true temperature is B =25.0°C.
l 8V . = - . _ .,
o(=—\7(:ﬁ)P =0L+b9 ) 9 T 273(5'7cﬁgt air
7 6‘
C7 3W, Somalia" ant-‘4) : at“ @2192“
V0 v 0 V0
(a ‘V/va = [aﬁ’r’bi ‘92]
-— V °' 0 ~—
@HM T : U95 0 74 40C. :2 “'I’OC-X Via/U0 i
V4.0 U0 V‘io/Vo—i ...

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