Friday
July 25, 2014

Homework Help: Chemistry

Posted by Angelina on Friday, October 22, 2010 at 2:48am.

I'm not sure if i did this problem right or not. I keep reading through my book, and i think i followed the equations right, but i'm not confident with my answers.

The problem:

5.0 g of glucose,C6H12O6, is disolved in 500.0 g of acetic acid. What is the new freezing point and boiling point for the solution? Kf acetic acid = 3.90, Kb acetic acid = 3.07 (normal freezing point for acetic acid = 16.60 degrees C, boiling point = 118.5 degrees C)

my work:

# of moles
(5g C6H12O6)(1mol C6H12O6/ 180g C6H12O6)
= 0.028 mol of C6H12O6

molality
(0.028mol/500g CH3COOH)(1000g CH3COOH/1kg)
= 0.056 mol solution

boiling point = 100degreesC+deltaTbp
= 100degreesC+mKbp
= 100degreesC+(0.056m)(3.07 C/m)
= 100.173 degrees C

freezing point = 0 degreesC-deltaTfp
= 0 degreesC-mKfp
= O degreesC-(0.056m)(3.90C/m)
= -0.218 degrees C

now, is that all there is (IF this is correct...)or is there more to solving this equation.

I really need help..Im so confused...Thank you

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Chemistry - Hi there - I'm going to post the question as written in my book. ...
Math - 8*2sq+7*(4+1)= ? Can someone explain to me what to after the parenthesis...
critical thinking - Can some please help with these questions. I just want to ...
Chemistry - can anyone check and see if i balanced the equation for the ...
Algebra - Could someone correct my answers and help with the other problems? 1. ...
Chem - I have to convert inches to 250 cm.My book states the expression to ...
math - Is (5,2) a solution of 4x-2y=-6 I said no, am I right? I am working on ...
algebra - Is (5,2) a solution of 4x-2y=-6 I said no, am I right? I am working on...
Chemistry - Please check this over and see of they are right...if they are not ...
Calculus - I finished the first question with no problem. It was something like...

Search
Members