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Chemistry assignment with full solutions thank you not sure if the standard enthalpy is needed use if it is Screen Shot 2020-07-24 at 1.45.07 PM.pngScreen Shot 2020-07-24 at 1.40.31 PM.png

Screen Shot 2020-07-24 at 1.40.31 PM.png
10. Ka = 5.0 X 10-10 for formic acid, CHOOH. Given an initial 0.20 mol/L solution
of formic acid calculate the following values at equilibrium (7):
CHOOH(aq) + H2O(aq) > H3O+ (aq) + CHOO- (aq)
a) [H+] (4)
b) PH (2)
c) POH (2)
d) Kb (2)
11. The reaction:
H2(9)
+ CO2(9)
CO(9)
+ H20(9)
Has a K = 0.771. If 5 mole each of hydrogen and carbon dioxide gas are placed in a
4.00 L flask, and allowed to react what will be the equilibrium concentrations of all four
gases? (5)
Screen Shot 2020-07-24 at 1.45.07 PM.png
Standard Enthalpy of Formation Data of Selected Elements and Compounds
Substance
AH,
Substance
Substance
AH,
KJ
KJ
KJ
mol
mol
mol
Al (S)
0
F2 ( 9 )
0
O3 ( 9)
142.3
Al203 (S)
-1669.8
HF (9)
-268.6
P (s) (white)
0
Br2 (1)
0
H2 (9 )
0
P (s) (red)
-18.4
HBr (9)
36.2
H20 (1)
-285.8
PH3 (9)
9.2
Ca (s)
0
H2O (9)
-249.2
PC13 (9)
-306.4
CaCO3 (s)
-1206.7
H202 (1)
-187.6
P406 (S)
-2144.3
(calcite)
CaCl2 (s)
-795
Fe ( s )
0
P4010 ( $)
-2984.0
C (s)
0
FeO (s)
-266.5
H3PO4 (S)
-1281.1
(graphite)
C (S)
1.9
Fe203 (s)
-822.2
K (S )
0
(diamond)
CCI4 ()
-139.3
Fe304 (S)
-1117.1
KCI ( S )
-435.9
CCI4 (9)
-106.7
FeCl2 (s)
-341
KCIO3 (S)
-391.2
CHCl3 (9)
-82.0
FeCl3 (s)
-405.0
KOH (S)
-425.8
CH4 (9)
-74.8
FeS2 (s)
-177.9
Ag (s)
0
C2 H2 (9)
226.7
Pb (s)
0
AgCI (s)
-127.0
C2H4 (9)
52.3
PbCl2 (s)
-359.2
AgNO3 (S)
-123.1
C2H6 (9)
-84.7
Mg (s)
0
Na (s
0
C3H8 (9)
-103.8
MgCl2 (s)
641.8
NaCl (s)
-411
C6H6 (1)
82.9
MgO (s)
601.8
NaOH (s)
-426.7
CH3OH (1)
-238.6
Hg (1)
0
NazCO3 (s)
-1130.9
C2H5OH (1)
-277.6
HgS (s) (red)
-58.2
S ( S )
0
(rhombic)
CH3CO2H (1)
-487.0
Ne (9)
O
S (9)
222.8
CO (9)
-110.5
N2 (9)
0
SF6 (9)
-1096.2
CO2 (9)
-393.5
NH3 (9)
-46.2
H 2S ( 9)
-20.1
CIO2 (9)
103.3
N2H4 (1)
50.4
SO2 (9)
-296.9
CS2 (9)
115.3
NH4CI (s)
315.4
SO3 (9)
-395.2
C12 (9)
0
NH4NO3 (S)
-365.1
H2SO4 (1)
-811.3
HCI (9)
-92.3
NO (9)
90.4
Sn ( s)
0
(white)
Cr ( s )
0
NO2 (9)
33.8
Sn ( s)
2.5
(gray)
CrCl3 (s)
-563.2
N20 (9)
81.5
SnCl2 (s)
-349.8
Cu (s )
0
N204 (9)
9.2
SnCl4 (1)
-545.2
CuO (s)
-155.2
HNO3 (1)
-173.2
CuCI
-136
O (9)
249.2
CuCl2 (s)
-205.9
O2 (9)
0

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