We saw in Section 6.7 that the reaction of solid sodium with giseous chlorine to yield solid sodium chloride ( Na + CI − ) is favorable by 411 kJ/mol. Calculate the energy change for the alternative reaction that yields chlorine sodide ( Cl + Na − ) , and then explain why sodium chloride formation is preferred. 2Na ( s ) + Cl 2 ( g ) → 2Cl + Na − ( s ) Assume that the lattice energy for Cl + Na − is the same as that for Na + Cl − . The following data are needed in addition to that found in Section 6.7: E ea for Na ( g ) = − 52 .9 kJ/mol E i1 for Cl ( g ) = + 1251 kJ/mol
We saw in Section 6.7 that the reaction of solid sodium with giseous chlorine to yield solid sodium chloride ( Na + CI − ) is favorable by 411 kJ/mol. Calculate the energy change for the alternative reaction that yields chlorine sodide ( Cl + Na − ) , and then explain why sodium chloride formation is preferred. 2Na ( s ) + Cl 2 ( g ) → 2Cl + Na − ( s ) Assume that the lattice energy for Cl + Na − is the same as that for Na + Cl − . The following data are needed in addition to that found in Section 6.7: E ea for Na ( g ) = − 52 .9 kJ/mol E i1 for Cl ( g ) = + 1251 kJ/mol
Solution Summary: The author explains the Born-Haber cycle of the formation of ionic solids from its constituent elements.
We saw in Section 6.7 that the reaction of solid sodium with giseous chlorine to yield solid sodium chloride
(
Na
+
CI
−
)
is favorable by 411 kJ/mol. Calculate the energy change for the alternative reaction that yields chlorine sodide
(
Cl
+
Na
−
)
, and then explain why sodium chloride formation is preferred.
2Na
(
s
)
+
Cl
2
(
g
)
→
2Cl
+
Na
−
(
s
)
Assume that the lattice energy for
Cl
+
Na
−
is the same as that for
Na
+
Cl
−
. The following data are needed in addition to that found in Section 6.7:
E
ea
for Na
(
g
)
=
−
52
.9 kJ/mol
E
i1
for Cl
(
g
)
=
+
1251
kJ/mol
Dr. Mendel asked his BIOL 260 class what their height was and what their
parent's heights were. He plotted that data in the graph below to determine if
height was a heritable trait.
A. Is height a heritable trait? If yes, what is the heritability value? (2 pts)
B. If the phenotypic variation is 30, what is the variation due to additive alleles?
(2 pts)
Offspring Height (Inches)
75
67.5
60
52.5
y = 0.9264x + 4.8519
55
60
65
MidParent Height (Inches)
70
75
12pt v
V
Paragraph B IUA
>
AT2 v
V
Experiment:
Each team will be provided with 5g of a mixture of acetanilide and salicylic acid. You will divide it into three 1.5 g portions in separate 125 mL Erlenmeyer flasks savıng some for melting point analysis. Dissolve the mixture in each flask in ~60mL of DI water by heating to boiling on a hotplate. Take the flasks off the hotplate once you have a clear solution and let them stand on the bench top for 5 mins and then allow them to cool as described below.
Sample A-Let the first sample cool slowly to room temperature by letting it stand on your lab bench, with occasional stirring to promote crystallization.
Sample B-Cool the second sample 1n a tap-water bath to 10-15 °C
Sample C-Cool the third sample in an ice-bath to 0-2 °C
Results:
weight after recrystalization and melting point temp.
A=0.624g,102-115°
B=0.765g, 80-105°
C=1.135g, 77-108
What is the percent yield of A,B, and C.
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