ch. 9:
Sec. 9.6-9.7
Chem 167
Instructor: Houk
Supplemental lnstruction
lowa State Universitv
1.
Emily M
Leader:
Course:
Date:
4l3l14
One reaction involved in the conversion of iron ore to the metal is
FeO(s) + CO(g) '-- Fe(s) + COr(g)
Calcutate the standard enthalpy change for this reaction from these reactions
of ironoxides with CO :
(1) 3Fer0r(s) + CO(g) * 2FerOu(s) + COr(g) AHo = -47.Akf Pt;Y
(2) Feror(s) + 3CO(g) "- 2Fe(s) + 3COr(g) AHo = -25.0kf t \3
AHo = 19.0kJ flp;rf(3) FerOn(s) + CO(g)'-'3Fe0(s) + COr(g)
=
2.
Calculate Alf for the combustion of butane gas, CaH1s, to produce gaseous carbon
dioxide and liquid water. @alance &e equation first!)
(l)
&C+Hro @)@z(g) +@oz(d 4lzo
Li?,8
l0
Comoound
C+Hro(e)
Ou (e)
COz (e)
DH --lrcdtld6 -rPnrfuAfs
= $u*-zB5.B) r(ar -sq?,{ 3.
-llw
(r3{0) r r,
HzO (l)
AHO
-725.7kllmol
0 kJ/mol
-393.5kJ/mol
-285.8kJ/mol
How much heat is released when 147 grarns of NOqgy is dissolved in excess water?
$NOr+ H,O ) 2HNOr + NO
t41
gNr11s1
AH = - t38kJ/ intl
xffi,*,:ffi=@
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4.
Propane gas, C3Hs, is a common fuel for camp stoves.
a)
b)
c)
d)
e)
0
g)
What is AH1" forpropane? (Use AHp'Table.)
Write a balanced thermocher4ical equation for the formation of propane from its
elements.
Is this reaction endothermic or exothermic?
How many moles of H2 me needed to produce 1090 kJ according to the equation in
b)?
How much heat is produced during the formation of 30.1 g of propane?
Write a balanced chemical equation for the complete combustion of propane.
find AH for the reaction in f) using AHf Table and Hess' Law.
C= -l03.g6lnol
b\ fu
SCts\ +-4Hzfg)
c) LYel'lofrnic,
d) loQo krr-x
.\
e) 3o.l g
$
CgHa,) bYt=-'ta?.8wfur
.t
W=
4Lfiul \u
oai'tt
* l06,Bkr = { I vr
,{,lg
hhs I mol tet'{o
+ S0r(S\ _) t^ozr$ r 4ll4
taHgy
P) cahs
r$)
)
['mo\
3
16
[tu* -6qb,5\+ (,t *-Ls5,sI - [tr x -\ug,s) *(rx 0))
=
- 1r1-1-o L{