Calculation Masses Question verfication

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Delta, Δ
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#1
Report Thread starter 8 years ago
#1
Hello guys,
The question says, 5.67g of propan-1-ol was oxidised in a reaction with a 64% yield. Calculate the mass of propanoic acid produced.
That's all the question says.

My answer is 3.88g, am I correct? Thanks!
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nabeel1231
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#2
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#2
(Original post by Delta, Δ)
Hello guys,
The question says, 5.67g of propan-1-ol was oxidised in a reaction with a 64% yield. Calculate the mass of propanoic acid produced.
That's all the question says.

My answer is 3.88g, am I correct? Thanks!
check by doing the following:
(3.88/5.67)*100
if it comes upto 64%, your answer is correct
sorry dont have a calculator handy otherwise id let you know if you were right lol

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Delta, Δ
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#3
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#3
(Original post by nabeel1231)
check by doing the following:
(3.88/5.67)*100
if it comes upto 64%, your answer is correct
sorry dont have a calculator handy otherwise id let you know if you were right lol

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thanks, so does this means that the reaction is a 1;1 ratio for propan-1-ol and propanoic acid?
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Veqz
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#4
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#4
(Original post by Delta, Δ)
thanks, so does this means that the reaction is a 1;1 ratio for propan-1-ol and propanoic acid?
I'd assume you could use stoichiometry to find the moles of propanoic acid, then calculate the Mr and multiply the values together to get the mass.
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Delta, Δ
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#5
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#5
(Original post by Veqz)
I'd assume you could use stoichiometry to find the moles of propanoic acid, then calculate the Mr and multiply the values together to get the mass.
Hello there,
Can you please explain! Thanks =-)
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Veqz
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#6
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#6
(Original post by Delta, Δ)
Hello there,
Can you please explain! Thanks =-)
Sorry, ignore me. I didn't read the question properly! But yes, answering your previous question, there is a 1:1 ratio.
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Borek
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#7
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#7
(Original post by Delta, Δ)
Hello guys,
The question says, 5.67g of propan-1-ol was oxidised in a reaction with a 64% yield. Calculate the mass of propanoic acid produced.
That's all the question says.

My answer is 3.88g, am I correct? Thanks!
Doesn't look correct to me.

Start by calculating theoretical yield.
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Delta, Δ
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#8
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#8
(Original post by Borek)
Doesn't look correct to me.

Start by calculating theoretical yield.
Here is what I done: Calculated the moles of propan-1-ol by doing mass/Mr, and i done 5.67/58 = 0.09776
Mr of propanoic acid is 62, so the mass produces is Mr x Moles. So, 62 x 0.09776 = 6.06 is the theoretical yield. Since it is 64% yield, I done 6.06 x 0.64 to get 3.88g.

Is this the right method? Thanks!
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Borek
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#9
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#9
(Original post by Delta, Δ)
Mr of propanoic acid is 62
Is it?
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Delta, Δ
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#10
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#10
(Original post by Borek)
Is it?
Oops, its 74!
Is the final answer 4.63g (3sf)? Thanks again!
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Borek
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#11
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#11
Your Mr of propanol is wrong as well.
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Delta, Δ
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#12
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#12
(Original post by Borek)
Your Mr of propanol is wrong as well.
Ooops, Can't seem to count today!

Is the final answer 4.48g (3sf)? Thanks again
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Borek
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#13
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#13
I got 4.47g, but I used 60.0950 and 74.0785 for molar masses (software I am using does the calculations using exact molar masses always).
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Delta, Δ
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#14
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#14
(Original post by Borek)
I got 4.47g, but I used 60.0950 and 74.0785 for molar masses (software I am using does the calculations using exact molar masses always).
Thanks.
I see, I was just using the Mr values with my A level periodic table.
What is that software you are using?
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Borek
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#15
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#15
Check my signature.
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