Circle the sample with the greatest entropy in each pair. a) 1.0 mol of H 2 (g)
ID: 1031136 • Letter: C
Question
Circle the sample with the greatest entropy in each pair.
a) 1.0 mol of H2(g) at 1.00 atm, 25ºC or 1.0 mol of H2(g) at 0.50 atm, 25ºC
b) 1.0 mol of H2(s) at 1.00 atm, 0 K or 1.0 mol of Fe(s) at 1.00 atm, 10 K
c) 1.0 mol CO2(g) at 1.00 atm, -77ºC or 1.0 mol CO2(s) at 1.00 atm, -77ºC
d) 1.0 mol CO2(g) at 1.00 atm, -77ºC or 2.0 mol CO2(g) at 1.00 atm, -77ºC
e) 3.0 mol C2H2(g) at 1.00 atm, 25ºC or 1.0 mol C6H6(g) at 1.00 atm, 25ºC
Possibly Useful Information:
Acid
Ka
pKa
Base
Kb
pKb
Hydrocyanic, HCN
4.8 x 10-10
9.32
ammonia, NH3
1.8 x 10-5
4.74
Chlorous, HClO2
1.0 x 10-2
2.00
nicotine, C10H14N2
1.0 x 10-6
6.00
Acetic, HC2H3O2
1.8 x 10-5
4.74
methylamine, CH3NH2
3.6 x 10-4
3.44
Carbonic, H2CO3
4.3 x 10-7
5.6 x 10-11
6.37
10.25
Hydrazine, H2NNH2
3.0 x 10-6
5.1 x 10-10
5.52
9.29
Sulfuric, H2SO4
¥
1.2 x 10-2
¥
1.92
Solid
Ksp
Sulfurous, H2SO3
1.5 x 10-2
1.2 x 10-7
1.81
6.91
Fe(OH)3
Ag2CO3
Ag2SO4
4.0 x 10–38
8.1 x 10–12
1.21 x 10–5
Phosphoric, H3PO4
7.6 x 10-3
6.2 x 10-8
2.1 x 10-13
2.12
7.21
12.67
Complex Ion
Ag(NH3)2+
Kf
1.7 x 10+7
0°C = 273.15 K R = 8.314 J/(mol × K) = 0.08206 L × atm/(mol × K) Kw = 1.008 x 10–14 at 25°C
Substance
Hfº(kJ/mol)
Sº(J/(mol × K))
H2O(l)
xxxxxxx
69.91
H2O(g)
–241.82
188.83
HCN(g)
+135.1
201.78
CH4(g)
–74.81
186.26
NH3(g)
–46.11
192.45
CO2(g)
–393.5
213.6
O2(g)
0
205.138
Acid
Ka
pKa
Base
Kb
pKb
Hydrocyanic, HCN
4.8 x 10-10
9.32
ammonia, NH3
1.8 x 10-5
4.74
Chlorous, HClO2
1.0 x 10-2
2.00
nicotine, C10H14N2
1.0 x 10-6
6.00
Acetic, HC2H3O2
1.8 x 10-5
4.74
methylamine, CH3NH2
3.6 x 10-4
3.44
Carbonic, H2CO3
4.3 x 10-7
5.6 x 10-11
6.37
10.25
Hydrazine, H2NNH2
3.0 x 10-6
5.1 x 10-10
5.52
9.29
Sulfuric, H2SO4
¥
1.2 x 10-2
¥
1.92
Solid
Ksp
Sulfurous, H2SO3
1.5 x 10-2
1.2 x 10-7
1.81
6.91
Fe(OH)3
Ag2CO3
Ag2SO4
4.0 x 10–38
8.1 x 10–12
1.21 x 10–5
Phosphoric, H3PO4
7.6 x 10-3
6.2 x 10-8
2.1 x 10-13
2.12
7.21
12.67
Complex Ion
Ag(NH3)2+
Kf
1.7 x 10+7
Explanation / Answer
a) 1.0 mol of H2(g) at 1.00 atm, 25ºC or 1.0 mol of H2(g) at 0.50 atm, 25ºC
b) 1.0 mol of H2(s) at 1.00 atm, 0 K or 1.0 mol of Fe(s) at 1.00 atm, 10 K
c) 1.0 mol CO2(g) at 1.00 atm, -77ºC or 1.0 mol CO2(s) at 1.00 atm, -77ºC
d) 1.0 mol CO2(g) at 1.00 atm, -77ºC or 2.0 mol CO2(g) at 1.00 atm, -77ºC
e) 3.0 mol C2H2(g) at 1.00 atm, 25ºC or 1.0 mol C6H6(g) at 1.00 atm, 25ºC
bolded ones are having greatest entropy.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.