HELP!!! Chemestry
Lindsey

Gregory, AR

#1 Apr 28, 2009
Open QuestionShow me another
More Chemistry Homework help! >.<?
Can you explain how you get the answers so I get how to do other problems:

1) A solution consists of 10.3 g of the nonelectrolyte glucose, C6H12O6, dissolved in 250. g of water. What is the freezing-point depression of the solution?

2) In a laboratory experiment, the freezing point of an aqueous solution of glucose is found to be -0.325 degrees Celsius. What is the molal concentration of this solution?

3) If 0.500 mol of a nonelectrolyte solute are dissolved in 500.0 g of ether, what is the freezing point of the solution?

4) A solution contains 50.0 g of sucrose, C12H22O11, a nonelectrolyte, dissolved in 500.0 g of water. What is the boiling-point elevation?

5) A solution contains 450.0g of sucrose, C12H22O11,a nonelectrolyte, dissolved in 250 g of water. What is the boiling point of the solution?

6) If the boiling point elevation of an aqueous solution containing a nonvolatile electrolyte is 1.02 degrees Celsius, what is the molality of the solution?

Thanks for your help!
jess ting

Harrisburg, PA

#2 Apr 28, 2009
Lindsey wrote:
Open QuestionShow me another
More Chemistry Homework help! >.<?
Can you explain how you get the answers so I get how to do other problems:

Answer is the explaination is it is common knowledge!

1) A solution consists of 10.3 g of the nonelectrolyte glucose, C6H12O6, dissolved in 250. g of water. What is the freezing-point depression of the solution?

Answer. A solution is never depressed!, even when freezing.

2) In a laboratory experiment, the freezing point of an aqueous solution of glucose is found to be -0.325 degrees Celsius. What is the molal concentration of this solution?

Answer. Zero.

3) If 0.500 mol of a nonelectrolyte solute are dissolved in 500.0 g of ether, what is the freezing point of the solution?

Answer. Absolute Kelvin.

4) A solution contains 50.0 g of sucrose, C12H22O11, a nonelectrolyte, dissolved in 500.0 g of water. What is the boiling-point elevation?

Answer. The boiling- point elevation is higher, than the non boiling-point.

5) A solution contains 450.0g of sucrose, C12H22O11,a nonelectrolyte, dissolved in 250 g of water. What is the boiling point of the solution?

Answer. Won't happen.


6) If the boiling point elevation of an aqueous solution containing a nonvolatile electrolyte is 1.02 degrees Celsius, what is the molality of the solution?

Answer. Won't happen unless on a Wednesday when stirred by a Hippopotamus after adding boiling chips.

Thanks for your help!
No problem for the help.

Can you believe I actually had to have a minor in Chemistry to get a B.S.?

Answers,

1) Zero degrees Celsius, which depresses me.

2).325 molal concetratoin X c squared, unless it happens on Wednesday.

3)Absolute Kelvin.

4) The "boiling point evaluation" of the proposed problem is "that is a very good boiling point".

5)100 degree Celsius.

6) Three megahertz!
easy

Ozark, AL

#3 Apr 28, 2009
get 12 ounces dihydrogenoxide,
6 ounces whiskey.
mix into a quart jar full of ice,
consume before ice gets to 33 degress F.
LOL

Saint Albans, WV

#4 Apr 28, 2009
easy wrote:
get 12 ounces dihydrogenoxide,
6 ounces whiskey.
mix into a quart jar full of ice,
consume before ice gets to 33 degress F.
Too Funny!!
Mr Wizard

Benton, LA

#5 Jun 29, 2009
Lindsey wrote:
Open QuestionShow me another
More Chemistry Homework help! >.<?
Can you explain how you get the answers so I get how to do other problems:
1) A solution consists of 10.3 g of the nonelectrolyte glucose, C6H12O6, dissolved in 250. g of water. What is the freezing-point depression of the solution?
2) In a laboratory experiment, the freezing point of an aqueous solution of glucose is found to be -0.325 degrees Celsius. What is the molal concentration of this solution?
3) If 0.500 mol of a nonelectrolyte solute are dissolved in 500.0 g of ether, what is the freezing point of the solution?
4) A solution contains 50.0 g of sucrose, C12H22O11, a nonelectrolyte, dissolved in 500.0 g of water. What is the boiling-point elevation?
5) A solution contains 450.0g of sucrose, C12H22O11,a nonelectrolyte, dissolved in 250 g of water. What is the boiling point of the solution?
6) If the boiling point elevation of an aqueous solution containing a nonvolatile electrolyte is 1.02 degrees Celsius, what is the molality of the solution?
Thanks for your help!
Hi Lindsey, Here I will help you with the first one, and see how you do.

First you need to find the molality which is mol / kg

10.3 g * 1 mol / 180.156 g = 0.0572 mol Glu

molality = 0.0572 mol Glu / 0.250 kg = 0.2287 m

Now for the freezing point depression

&#8710;Tf = Kf * m

And the boiling point elevation

&#8710;Tb = Kb * m

where Kb for water is 0.521 C / m

Where Kf for water is 1.858 C / m

&#8710;Tb = 0.521 C /m * 0.2287 m = 0.119

&#8710;Tf = 1.858 C / m * 0.2287 m = 0.425

So the boiling point is now 100 C + 0.119 C = 100.119 C

freezing point is 0C - 0.425 C =-0.425 C

Now for the rest of the problems

2) do this backwards

3) do the same I did for #1 but use Kb = 2.20 Kf = 7.88

4) follow what I did

5) follow what I did

6) solve for m

Simple.

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