Assignment # 1
Hvap water = 40.7 KJ/mol Hfus water = 6.01 KJ/mol
Solid Cwater = 2.03 J/g°C
Liquid Cwater =4. 184 J/g°C
Gas Cwater = 2.01
1. How much heat is in the process of condensing 305 g of liquid water to
2. If 447 g of water at 75.9 °C loses 8750 J of heat, what is the final
temperature of the water?
3. Calculate AG for each of the process and state if the process is spontaneous or
nonspontaneous if you are given the following information:
AH- 145 kJ, T- 293 K, AS- 195 J/k
Gibbs Free Energy S
4. A 3.51 g sample of an unknown substance at 976 °C is heated to steam at
2620 °C. How much heat is absorbed? The unknown substance melts at 968 °C,
and boils at 2255 °C.
Molar mass of the substance is 115g/mol. (q-mcAT)
Csubstance (solid) 0.235 J/g°C
Csubstance (liquid) 0.290 J/g°C
Csubstance(sas) 0.245 J/g°C
AHnus 11.2 kJ/mol
AHvap 255 kJ/mol
5. Find AH° for the reaction
2H2(g) + 2C(s) + O2(g) --> C2HsOH(I)
using the following thermochemical data.
C2H5OH (I) +202 (g) --> 2 CO2 (g) + 2H2O (I)
C (s) + O2(g) --> CO2 (g)
Assignment # 2
1. Use Le Chatelier's principle to determine where the stress lie, which
direction will you shift to relieve the stress, and how will you make the
AH 98 KJ
THIS IS NOT A MULTIPLE CHOICE PROBLEM EACH LETTER IS A
a) [HCI] is increased
b) [H2O] is increased
c) [O2] is decreased
d) Temp is increased
e) Volume decrease
f) Pressure decreased
2. Find the pH, pOH, and [H*] of a 4.66 x 10-3 M Ba(OH)2. Hint this is a
3. Find the pH, pOH, and [OH-] of a 3.21 x 10-2 M HNO3. Hint this is a
4. Find the concentration of [CO2], if the Keq = 4.35, [O2] = 0.450,
[H20] = 0.751, and [C2He] = 1.23
2C2H8(g) + 702(g) 0 4CO2(g) + 6H2O(g)
5. Label the acid, base, conjugate acid, and conjugate base pairs for the
following reaction below.
HBr (aq) +
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