OnlineConversion Forums Welcome to OnlineConversion.com Forums

Go Back   OnlineConversion Forums > Main Forums > Convert and Calculate

Convert and Calculate Post any conversion related questions and discussions here. If you're having trouble converting something, this is where you should post.
* Guest Posting is allowed.

Reply
 
Thread Tools Display Modes
  #1  
Old 02-20-2009, 12:11 PM
www
Guest
 
Posts: n/a
Default weight to mol percent

how to convert 15 mole percent of styrene (MW=104 g/mol) to weight percent, if we know the other monomer M (MW= 54 g/mol) is 85 mole % in the polymer?
Is this info enough or dowe need more data to get the conversion?
Reply With Quote
  #2  
Old 02-20-2009, 12:32 PM
JohnS JohnS is offline
Moderator
Long Time Member The Golden Calculator Award Over 5000 Posts
 
Join Date: Dec 2007
Location: SE Michigan, USA
Posts: 9,533
Rep Power: 19
JohnS will become famous soon enough
Default Re: weight to mol percent

Quote:
Originally Posted by www
how to convert 15 mole percent of styrene (MW=104 g/mol) to weight percent, if we know the other monomer M (MW= 54 g/mol) is 85 mole % in the polymer?
Is this info enough or dowe need more data to get the conversion?
Imagine that you have 100 moles total mixture, 15 moles styrene, 85 moles of the other monomer.

The weights of the mixture components are 15 moles*104 g/mol = 1560 g styrene, and 85 moles * 54 g/mole = 4590 g of the other monomer.


The total mixture is 1560 g + 4590 g = 6150 g,
and the weight ratio of styrene to total mixture is
1560 g/6150 g = 25.4%

Since we postulated 100 moles, and total weight is 6150 g, the average molar mass of the mixture is 61.5 g/mol, and you can get the same answer as
15% * 104 g/mol / 61.5 g/mol (this "average" approach is often used for pollutants mixed in air)
Reply With Quote
  #3  
Old 02-23-2009, 04:59 AM
Tanu
Guest
 
Posts: n/a
Default Re: weight to mol percent

John thanks a lot for the explanation. It seems very simple now.
Reply With Quote
  #4  
Old 07-21-2009, 02:37 AM
Unregistered
Guest
 
Posts: n/a
Default How to calculate mol percent

5mol percent of 6.26grm of Bi2O3
Reply With Quote
  #5  
Old 12-06-2009, 01:29 AM
Unregistered
Guest
 
Posts: n/a
Default Re: How to calculate mol percent

Quote:
Originally Posted by Unregistered View Post
5mol percent of 6.26grm of Bi2O3
I want to know how to calculate 10 mol % of CuO
Reply With Quote
  #6  
Old 09-26-2011, 08:17 PM
Unregistered
Guest
 
Posts: n/a
Default Re: How to calculate mol percent

I want to know how to calculate 10 mol % of para toluene sulphonic acid
Reply With Quote
  #7  
Old 10-10-2011, 01:38 AM
Unregistered
Guest
 
Posts: n/a
Default Re: weight to mol percent

the mole%of sodium hydroxide weight of 100gm.
Reply With Quote
  #8  
Old 10-10-2011, 04:48 AM
JohnS JohnS is offline
Moderator
Long Time Member The Golden Calculator Award Over 5000 Posts
 
Join Date: Dec 2007
Location: SE Michigan, USA
Posts: 9,533
Rep Power: 19
JohnS will become famous soon enough
Default Re: weight to mol percent

Quote:
Originally Posted by Unregistered View Post
the mole%of sodium hydroxide weight of 100gm.
Approximate molar mass is (23 + 16 + 1) g/mol or 40 g/mol
100 g is about 2.5 mol. No percent involved.

If it is pure sodium hydroxide then it is 100% sodium hydroxide whether by weight, volume, or molar ratios. Percent and parts per million are for mixtures of one thing in another thing.
Reply With Quote
  #9  
Old 11-07-2011, 07:14 PM
Unregistered
Guest
 
Posts: n/a
Question Re: weight to mol percent

What if I am given a molar flow rate (300mol/h) for a gas stream but am given %wt percents for each species in the stream? How can these be converted to mol%?
Reply With Quote
  #10  
Old 11-08-2011, 02:14 AM
JohnS JohnS is offline
Moderator
Long Time Member The Golden Calculator Award Over 5000 Posts
 
Join Date: Dec 2007
Location: SE Michigan, USA
Posts: 9,533
Rep Power: 19
JohnS will become famous soon enough
Default Re: weight to mol percent

Quote:
Originally Posted by Unregistered View Post
What if I am given a molar flow rate (300mol/h) for a gas stream but am given %wt percents for each species in the stream? How can these be converted to mol%?
First, are you sure they are weight percents? Gases are usually specified by molar percents or partial pressures (the same if you assume ideal gas law).

If they are percent by weight, divide by the molecular weight of the species and multiply by the (average) molecular weight of the mixture.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -8. The time now is 01:53 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright 1997-2005, 2007, OnlineConversion.com