# Organic Chemistry

posted by .

Compound A is recrystallized from n-propanol. Given are the following solubilities (in 100 mL of solvent): 160 g/100 °C, 100 g/80 °C, 60 g/60 °C, 20 g/20 °C, 15 g/10 °C and 10 g/0 °C. How many milliliters of solvent are needed to dissolve 80.0 g of compound A during the recrystallization?

800 mL
134 mL
400 mL
50 mL
80 mL

• Organic Chemistry -

At what temperature do you wish to start? That will be dictated partially by the melting point of compound A as well as the boiling point of n-propanol. For example, (but you don't want to use this one), if we use the 100 C data,

100 mL x (80/160) = 50 mL. However, you don't want to use this one because n-propanol boils < 100 C. In fact, if you will look at the data, every possible answer is there using the formula,
100 mL x (80/table value) = ??
Therefore,
100 mL x 80/160 = 50 mL
100 mL x 80/100 = 80
100 mL x 80/60 = 133
100 mL x 80/20 = 400
etc.
Look at your notes and in the lab preparation material, as well as the melting point of compound A to make your choice.

## Similar Questions

1. ### statistics

A professional basketball player has embarked on a program to study his ability to shoot foul shots. On each day in which a game is not scheduled, he intends to shoot 100 foul shots. He maintains records over a period of 40 days of …
2. ### chemistry -drbob222

I'm not sure if my 1 and 2 are correct, and I don't know how to do 3, 4, and 5. Any help is appreciated! 1) You wish to extract an organic compound from an aqueous phase into an organic layer. to minimizing the number of transfer steps, …
3. ### chemistry

The solubility of compound A in ethanol is 0.8 g per 100 mL at 0°C and 5.0 g per 100 mL at 78°C. What is the minimum amount of ethanol needed to re-crystallize a 12.0 g sample of compound A?
4. ### Chemistry

The solubility of compound A in ethanol is 0.4 g per 100 mL at 0C and 5.0 g per 100 mL at 78C. What is the minimum amount of solvent needed to recrystallize an 8.0 g sample of compound A?

The following data were collected on non-conformances for a period of 10 days. Day Sample Size Non-conformances 1 100 12 2 100 14 3 100 10 4 100 18 5 100 22 6 100 14 7 100 15 8 100 13 9 100 14 10 100 16 On what day is the proportion …
6. ### chemistry

What is molarity of propanol, C3H7OH, when 60. mL propanol is mixed with enough H2O to make a final volume of 100. mL?
7. ### Chemistry: Organic Chemistry

Optically pure 2-octyl sulfonate, a compound with a leaving group comparable to the tosylate and mesylate groups discussed in this chapter, was treated with varying mixtures of dioxane and water as solvent. The optical purity of the …
8. ### chemistry

1. You are given a mixture containing two compounds, A and B. Both compounds have a solubility of 1 g/ 100 mL of solvent at 20 °C and 16 g/ 100 mL of solvent at 100 °C. The sample is composed of 3.5 g of A and 10 g of B. At 100 °C …
9. ### organic chemistry

4. A 300-ml aqueous solution containing 40 g compound A is to be extracted with ether. The solubility of compound A in either at room temperature is 20 g per 100 ml and in water is 13.3 g per 100 ml. calculate the weight of the compound …
10. ### Maths GRE

What single discount is equivalent to two successive discounts of 15% and 10% 100 - {(100-first discount) X (100- second discount)/100} = 100 - (100-15)X(100-10)/100 = 100 - 85 X 90/100 = 100 - 76.5 = 23.5

More Similar Questions