t
ch.9:
Leader: Emily M
Course: Chem 167
Instructor: Burnett
Sec. 9.4
Supplemental lnstruction
lowa State University
Date: lllrcl13
L. A metal radiator is made from 26.0 kg of iron. The specific heat of iron is 0.449 J/g'"9.
How much heat must be supplied to the radiator to raise its temperature from 25.0 to
55.0"C?
V
!f'ft1c'/ff
ff\= ?-{grNb3
@,00ry) [o''{{9
t lSrN lo5' a'L- Lb' o'$ = 3.50x toif
Copper wires used to transport electrical current heat up because of the resistance in the
wire. If a 140 g wire gains 280 J of heat, what is the change in temperature in the wire?
Copper has a specific heat of 0.384 Jlg'"C.
tts05,
({
loar,tflgrr)(ot\
[,r-- 5,1-t't
3. A piece of titanium
metal with a mass of 28.0 g is heated in boiling water to 99.5oC and
then dropped into a coffee cup calorimeter containing 75.0 gof water at2l.7oC. When
thermal equilibrium is reached, the frnal temperature is24.3"C. Calculate the specific
heat capacity of titanium. (The specific heat of water is 4.18 J/g'"9.,
4*ov-ti+fl7o is atua.l
@grw LH$=_$
-@-ttil \L+,3'c-Q, r'.i = gh,y ec) (1,1 o,c-LtI,E
1,5bY' l0?0
4.
"c) [Lr),
$t o e
Q
When a 1.000 g sample of the rocket fuel hydrazine, N2H4, is burned in a bomb
calorimeter which contains 1200 g of water, the temperature rises from 24.62C to
28.16"C. If the C for the bornb is 840 J/"C, calculate qro, for combustion of a one-gram
sample.
0*n
= - [qr,ro
+\ruut,rt1ud\ (*n{Q*'xw\H,D(c*il]t"t
h*n - 6.,Bqeqr),6ffiil1"\1+0{D<t,\Wf,N
frn
1060
=
Hixson-Lied
- 0 tf tlgo)t^o q\, [0lor/r)
[r,rtc)
l(f\ = - Lb,'lKf or - /0,Y60 r
.i.
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