Page 309 - Chemistry eBook

Heat of Reaction: Table I, Reffy
Heat of Reaction: Table I, Reffy (p. 5)
This table lists the heat of reactions for several reactions. • If the ∆H has a + sign
before the number, the reaction is endothermic (gaining energy).
• If the ∆H has a – sign before the number, the reaction is exothermic (releasing energy).
Table J
Table I
Heats of Reaction at 101.3 kPa and 298 K
Reaction ∆H (kJ)* CH4(g) + 2O2(g) CO2(g) + 2H2O(􏰀) –890.4 C3H8(g) + 5O2(g) 3CO2(g) + 4H2O(􏰀) –2219.2 2C8H18(􏰀) + 25O2(g) 16CO2(g) + 18H2O(􏰀) –10943 2CH3OH(􏰀) + 3O2(g) 2CO2(g) + 4H2O(􏰀) –1452 C2H5OH(􏰀) + 3O2(g) 2CO2(g) + 3H2O(􏰀) –1367 C6H12O6(s) + 6O2(g) 6CO2(g) + 6H2O(􏰀) –2804
2CO(g) + O2(g) 2CO2(g) C(s) + O2(g) CO2(g) 4Al(s) + 3O2(g) 2Al2O3(s) N2(g) + O2(g) 2NO(g) N2(g) + 2O2(g) 2NO2(g) 2H2(g) + O2(g) 2H2O(g) 2H2(g) + O2(g) 2H2O(􏰀) N2(g) + 3H2(g) 2NH3(g) 2C(s) + 3H2(g) C2H6(g) 2C(s) + 2H2(g) C2H4(g) 2C(s) + H2(g) C2H2(g) H2(g) + I2(g) 2HI(g)
–566.0 –393.5 –3351 +182.6 +66.4 –483.6 –571.6 –91.8 –84.0 +52.4 +227.4 +53.0 +34.89 –44.51 +14.78 +25.69 +3.88 –48.83
KNO3(s) H2O NaOH(s) H2O NH4Cl(s) H2O
K+(aq) + NO3–(aq) Na+(aq) + OH–(aq) NH4+(aq) + Cl–(aq)
H2O NH4+(aq) + NO3–(aq) Na+(aq) + Cl–(aq)
Li+(aq) + Br–(aq)
NH4NO3(s)
NaCl(s) H2O
LiBr(s) H2O
H+(aq) + OH–(aq) H2O(􏰀) –55.8
*The ∆H values are based on molar quantities represented in the equations. A minus sign indicates an exothermic reaction.
Most Active
Nonmetals Most
Activity Series**
Metals
Li F2 Rb Cl2 K Br2 Cs I2 Ba
Sr
Active
Great news! No need to
Na
Mg
Al
the bottom of the table
Ca
memorize this. Here’s
aTi Boosters trick. On
Mn
Zn
in
says, “A minus sign
it
Cr Fe
Co
dicates an exothermic
Ni
action”. Then we know
rSn
e
P
b tH2
e opposite is true too:
h
C
u Ag
A plus sign indicates an
Reference Tables for Physical Setting/Chemistry – 2011 Edition
5
Au Least Active
Least Active
**Activity Series is based on the hydrogen standard. H2 is not a metal.
endothermic reaction.
UNIT 8: KINETICS AND EQUILIBRIUM © 308