3. Use the eutectic diagram on the following page for the following questions. (a) What is the theoretical melting point for a mixture containing 80% by mole of A? (b) Describe the change in composition of the solution containing a mole fraction of 0.10 A as the temperature increases from 132 to 133°C? 138

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Chapter1: Chemical Foundations
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can you help with 3 sub questions (a) and (b)

3. Use the eutectic diagram on the following page for the following questions.
(a) What is the theoretical melting point for a mixture containing 80% by mole of A?
(b) Describe the change in composition of the solution containing a mole fraction of 0.10 A
as the temperature increases from 132 to 133°C?
138
136
134
132
130
0.00
0.20
0.40
0.60
0.80
1.00
XA
4. Why must the spot be applied to the TLC plate above the level of development solvent?
5. A Grignard reaction of phenylmagnesium bromide with 3-pentanone gives 3-phenylpentan-
3-ol as the major product (we will discuss this reaction later). The crude product contains the
3-phenylpentan-3-ol product, unreacted 3-pentanone, and biphenyl (a side product). A
developing solvent is found that separates the mixture into three spots on a silica gel TLC
plate.
Considering the functional groups present, predict which compounds would have the
smallest and largest Rf values. Briefly justify your answer.
Temperature (°C)
Transcribed Image Text:3. Use the eutectic diagram on the following page for the following questions. (a) What is the theoretical melting point for a mixture containing 80% by mole of A? (b) Describe the change in composition of the solution containing a mole fraction of 0.10 A as the temperature increases from 132 to 133°C? 138 136 134 132 130 0.00 0.20 0.40 0.60 0.80 1.00 XA 4. Why must the spot be applied to the TLC plate above the level of development solvent? 5. A Grignard reaction of phenylmagnesium bromide with 3-pentanone gives 3-phenylpentan- 3-ol as the major product (we will discuss this reaction later). The crude product contains the 3-phenylpentan-3-ol product, unreacted 3-pentanone, and biphenyl (a side product). A developing solvent is found that separates the mixture into three spots on a silica gel TLC plate. Considering the functional groups present, predict which compounds would have the smallest and largest Rf values. Briefly justify your answer. Temperature (°C)
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