How much energy, in kilojoules, is released or absorbed from the reaction of 1 mole of nitrogen, N 2 , with 3 moles of molecular hydrogen, H 2 , to form 2 moles of ammonia, NH 3 ? Consult Table 13.1 for bond energies. (a) + 899 kJ / mol (b) − 993 kJ / mol (c) + 80 kJ / mol (d) − 80 kJ / mol
How much energy, in kilojoules, is released or absorbed from the reaction of 1 mole of nitrogen, N 2 , with 3 moles of molecular hydrogen, H 2 , to form 2 moles of ammonia, NH 3 ? Consult Table 13.1 for bond energies. (a) + 899 kJ / mol (b) − 993 kJ / mol (c) + 80 kJ / mol (d) − 80 kJ / mol
How much energy, in kilojoules, is released or absorbed from the reaction of
1
mole of nitrogen,
N
2
, with
3
moles of molecular hydrogen,
H
2
, to form
2
moles of ammonia,
NH
3
? Consult Table 13.1 for bond energies.
Chromium(III) oxide reacts with hydrogen sulfide (H2S) gas to form chromium(III) sulfide and water:
Cr2O3(s) + 3H2S(g)→Cr2S3(s) + 3H2O(l)
To produce 681 g ofCr2S3
(a) how many moles ofCr2O3are required?
(b) how many grams ofCr2O3are required?
Fe3+ ion was reduced to its amalgam from solutions that were 2.0 x 10 3 M Fe3+, 0.1 M KNO,.
Fe3+ + 3e + Hg Fe(Hg)
Addition of Br ions forms a complex. E was shifted with each addition of the anion.
The shifts in E,, were plotted against log[Br ]. The slope was found to be -0.021 with an intercept of -0.13.
Calculate the formation constant (Kf) of the complex.
O 2.7 x 107
3.9 x 10-6
O 1.9 x 10-5
5.4 x 104
O 4.8 x 1013
HOME WORK
For a Pb-30% Sn alloy, determine the phases
present, their amounts, and their compositions
400
at 300°C, 200°C, and 30°C
L.
300
Liquidus
Solidus
Liquidus
L+B
a+L
Solidus
200
α
19
183
61.9
97.5
Eutectic
Solvus
Solvus-
(E)
100
a+B
a + E
E+B
Pb
20
40
60
80
Sn
Metallurgy | Bassim Shaheen Bachy.
Weight percent tin
Temperature ('C)
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The Laws of Thermodynamics, Entropy, and Gibbs Free Energy; Author: Professor Dave Explains;https://www.youtube.com/watch?v=8N1BxHgsoOw;License: Standard YouTube License, CC-BY