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Topic: Please check the problem (Read 5281 times)
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oceanmd
Full Member
Posts: 114
Mole Snacks: +2/-19
Please check the problem
«
on:
February 22, 2008, 03:22:54 AM »
What is the limiting reagent and how much excess reagent is there and how much Aluminum Phosphate is produced if 25.0 g of Al reacts with 100 g of H3PO4?
Is this equation correct 2Al+2H3PO4=2AlPO4+3H2
Al-limiting reagent
H3PO4 is in excess by 8.82g
113.41 g AlPO4 is produced
Please tell me if this makes any sense.
Thank you
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ARGOS++
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Posts: 1489
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Re: Please check the problem
«
Reply #1 on:
February 22, 2008, 04:21:54 AM »
Dear
Oceanmd
;
Al as limiting is ok!
For all other:
If I would use the wooden calculator, then I could probably accept your results.
Can you do it a little more precise? - Only for you, not for me.
Good Luck!
ARGOS
++
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oceanmd
Full Member
Posts: 114
Mole Snacks: +2/-19
Re: Please check the problem
«
Reply #2 on:
February 22, 2008, 04:51:31 AM »
25 g Al /26.982= 0.9265 mol Al
100 g H3PO4 / (3 x 1.01+30.974+4 X 16) = 100/98 = 1.02 mol H3PO4
1.02-0.9265 = 0.0935 mol H3PO4
0.0935 x 98 = 9.163 g H3PO4 in excess
0.9265 x 121.95 = 112.99 g AlPO4 is produced.
Argo, Is this any better?
Thanks
H3PO4 is in excess by 8.82g
113.41 g AlPO4 is produced
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ARGOS++
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Re: Please check the problem
«
Reply #3 on:
February 22, 2008, 04:59:17 AM »
Dear
Oceanmd
;
That’s very much better!
But tell me, Why you forgot to delete the last two lines?
Otherwise I would say:
Nearly perfect!
Good Luck!
ARGOS
++
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oceanmd
Full Member
Posts: 114
Mole Snacks: +2/-19
Re: Please check the problem
«
Reply #4 on:
February 22, 2008, 05:15:30 AM »
Calculate the number of grams of H2SO4 produced when 27 g of H2o reacts with 10 g SO
H2O+SO3=H2SO4
SO3-limiting
12.26 g H2SO4 produced.
This is the last problem for tonight. Is it correct.
Thank you, ARGO.
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ARGOS++
Sr. Member
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Re: Please check the problem
«
Reply #5 on:
February 22, 2008, 05:33:40 AM »
Dear
Oceanmd
;
It is ok.
I believe too, that it is time for your bed, because you forgot the index “3” (it’s SO
3
not SO) and you forgot how much Excess water you have.
And sorry: My “Name” ends with an “s”.
Have a good Sleep!
Good Luck!
ARGOS
++
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oceanmd
Full Member
Posts: 114
Mole Snacks: +2/-19
Re: Please check the problem
«
Reply #6 on:
February 22, 2008, 05:42:21 AM »
ARGOS,
Thank you for all your help.
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Please check the problem