% Yield Calculations
- junglemonkey
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% Yield Calculations
Can someone please help me out with organic percentage yield calculations? I'm so lost. Even just a method or something you can write out for me, I don't really understand what I'm doing. I'm so gutted cause my organic chemistry has been top notch after 3 years of struggling to understand it!
Here's an example question...
Qu. In the oxidation of Butan-1-ol to butanone shown below, calculate the mass of butanone formed when 5.0g of butan-1-ol is reacted and the yield of the reaction is 62.5%
(sorry no subscript)
C4H9OH ---> C4H8O
butan-1-ol butanone
--------------------------------------
And this type...
The manufacture of methanol from synthesis gas can be shown by the equation:-
CO(g) + 2H2(g) ---> CH3OH(g)
In a convertor it was found that 1400kg of carbon monoxide formed 900kg of methanol. What is the percentage yield of the reaction?
Anyone!?!?!?
Here's an example question...
Qu. In the oxidation of Butan-1-ol to butanone shown below, calculate the mass of butanone formed when 5.0g of butan-1-ol is reacted and the yield of the reaction is 62.5%
(sorry no subscript)
C4H9OH ---> C4H8O
butan-1-ol butanone
--------------------------------------
And this type...
The manufacture of methanol from synthesis gas can be shown by the equation:-
CO(g) + 2H2(g) ---> CH3OH(g)
In a convertor it was found that 1400kg of carbon monoxide formed 900kg of methanol. What is the percentage yield of the reaction?
Anyone!?!?!?
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- Doh!-Nut
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Re: % Yield Calculations
900 is what percent of 1400?
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- junglemonkey
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Re: % Yield Calculations
No, I'm talking about actual/theoretical values!! You have to work out what, in theory, would be the value and what it really is.
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- Doh!-Nut
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Re: % Yield Calculations
I know. Do you know Molar Mass?
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- junglemonkey
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Re: % Yield Calculations
mass/GFM yeah? Number of moles?
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Re: % Yield Calculations
Number of moles helps you figure out yieldage.
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- junglemonkey
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Re: % Yield Calculations
Yes, I know. Any chance of telling me how to do them? General method? Some sort of explanation?
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Re: % Yield Calculations
Me doing your homework for you? How silly.
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- Kristina
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Re: % Yield Calculations
You first balance the equation
(which you did)
then you find the molar mass of the product
You take the mass of the actual product you got in your experiment
like a fraction
actual reaction product in molar mass
---------------------------------- = percent yeild
theroretical reaction product in molar mass
But since you have the percent yeild, you work it just like algebra
X
----------------------------------- = 62.5%
72.04 g/mol (theroretical reaction product in molar mass)
72.04 * .625 = 45.025
Now.. Check your work
Does this work out?
45.025 g/mol
--------------- = 62.5% (or .625 in decimals)
72.04 g/mol
Yesss it does.. Yay very simple
sorry I didn't get to you sooner! If you need anymore help, just ask!
(which you did)
then you find the molar mass of the product
You take the mass of the actual product you got in your experiment
like a fraction
actual reaction product in molar mass
---------------------------------- = percent yeild
theroretical reaction product in molar mass
But since you have the percent yeild, you work it just like algebra
X
----------------------------------- = 62.5%
72.04 g/mol (theroretical reaction product in molar mass)
72.04 * .625 = 45.025
Now.. Check your work
Does this work out?
45.025 g/mol
--------------- = 62.5% (or .625 in decimals)
72.04 g/mol
Yesss it does.. Yay very simple
sorry I didn't get to you sooner! If you need anymore help, just ask!
There's always someone cooler than you
- junglemonkey
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Re: % Yield Calculations
Me doing your homework for you? How silly.
How silly? That WASN'T my homework, this is a general point in my higher chemistry course I don't understand, therefore I asked for help. Therefore I asked for a method or an explanation.
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