Home | Community | Message Board

NorthSpore.com BOOMR Bag!
This site includes paid links. Please support our sponsors.


Welcome to the Shroomery Message Board! You are experiencing a small sample of what the site has to offer. Please login or register to post messages and view our exclusive members-only content. You'll gain access to additional forums, file attachments, board customizations, encrypted private messages, and much more!

Jump to first unread post Pages: 1
Invisiblemutantmushroom
The Mutant
Male


Registered: 10/01/13
Posts: 416
Loc: Daytona
Im stuck on another chemistry problem
    #19290213 - 12/17/13 07:25 PM (10 years, 2 months ago)

10 g of Oxygen can make _ g of Aluminum Oxide


--------------------
When you put the best effort you can into something, you’re bound to get something good out of it



Extras: Filter Print Post Top
OfflineUzziel
O_o


Registered: 12/30/10
Posts: 11,689
Last seen: 4 years, 2 months
Re: Im stuck on another chemistry problem [Re: mutantmushroom]
    #19290236 - 12/17/13 07:30 PM (10 years, 2 months ago)

Are we assuming you have infinite amounts of Al?


Extras: Filter Print Post Top
OfflineSkeletalSpore
♥$♄ґ◎◎мεя⑂♥
Male


Registered: 01/25/13
Posts: 602
Loc: Lake Titicaca, Canada Flag
Last seen: 5 years, 7 months
Re: Im stuck on another chemistry problem [Re: mutantmushroom]
    #19290248 - 12/17/13 07:32 PM (10 years, 2 months ago)

I remember doing problems like that in grade 10 general science  :idea:
I would've definetely helped you if I remembered...

I think you supposed to convert oxygen into moles first... and Aluminum oxide is Al2O3... so you do something with that lol


--------------------
:dancingbear: :vibin:


Extras: Filter Print Post Top
Invisiblethe mad machinest
Medicine Man
Male User Gallery


Registered: 04/18/13
Posts: 4,249
Loc: parallel universe #420
Re: Im stuck on another chemistry problem [Re: SkeletalSpore]
    #19290266 - 12/17/13 07:36 PM (10 years, 2 months ago)

from wiki:

hope this helps:shrug:


"
1. First, find the moles of each.

Grams -> moles

Given gram x 1 mol/molar mass


Molar mass Al: 26.98 g/mol

Molar mass O2: 32.00 g/mol


10.0 g Al x 1 mol Al/26.98 g Al = 0.3706 mol Al

19.0 g O2 x 1 mol O2/32.00 g O2 = 0.5938 mol O2


2. Then using the balanced equation, set up a mole ratio: Coefficients/Number of moles.

4 Al/0.3706 mol Al = 3 O2/x

We pretend we don't know the moles of O2.

By crossing multiplying, we find x = 0.2780 mol O2, which is less than 0.5938 mol O2. This tells us we will have EXTRA O2, and that Al is our limiting reactant.


3. Do a regular stoichiometry problem:

Molar ratio: 2 mol Al2O3 : 4 mol Al .... which can be reduced to 1 mol Al2O3 : 2 mol Al

Molar mass Al2O3: 101.96 g/mol

10.0 g Al x 1 mol Al/26.98 g Al x 1 mol Al2O3/2 mol Al x 101.96 g Al2O3/1 mol Al2O3 = 18.895 g Al2O3


Sig figs... 18.9 g Al2O3


--------------------
:hummer:

:trees::trees:

:aweyeah::trippinbawelz::awecid:
.         



         
             
             
                                              :redneck::tentjump:                         :hole:


Extras: Filter Print Post Top
Onlinekoods
Ribbit
Male User Gallery


Registered: 05/26/11
Posts: 106,396
Loc: Maryland/DC Burbs
Last seen: 4 minutes, 43 seconds
Re: Im stuck on another chemistry problem [Re: the mad machinest]
    #19290379 - 12/17/13 08:03 PM (10 years, 2 months ago)

Aluminum Oxide by weight is 47.07% oxygen. (The Merck index is really handy)

10/.4707=21.244g

Mad machinist gave you the amount of alumina if you had 10g of aluminum.

10/.5293=18.892g


--------------------
NotSheekle said
“if I believed she was 16 I would become unattracted to her”


Edited by koods (12/17/13 08:09 PM)


Extras: Filter Print Post Top
Invisiblemutantmushroom
The Mutant
Male


Registered: 10/01/13
Posts: 416
Loc: Daytona
Re: Im stuck on another chemistry problem [Re: koods]
    #19290387 - 12/17/13 08:05 PM (10 years, 2 months ago)

ya how much aluminum do you mix with 10 g of x
Quote:

koods said:
Aluminum Oxide by weight is 47.07% oxygen. (The Merck index is really handy)

10/.47.07=21.244g



thank you!


--------------------
When you put the best effort you can into something, you’re bound to get something good out of it



Extras: Filter Print Post Top
Invisiblefiddle
Male User Gallery

Folding@home Statistics
Registered: 04/10/08
Posts: 1,769
Loc: PNW
Re: Im stuck on another chemistry problem [Re: mutantmushroom]
    #19290393 - 12/17/13 08:06 PM (10 years, 2 months ago)

Grams to moles to moles to grams.

It's a stoichiometry and limiting reagents problem. Assuming you have an infinite supply of Al, then O2 becomes your limiting reagent and it simply becomes as stoichiometry problem.

Write out the chemical reaction.

How many moles of O2 do you have per 10g?
How many moles of O2 react per mole of Al?
How many moles of AlO can be produced?
How grams of AlO is that?

Grams to moles to moles to grams.


--------------------
Tickle my bassline.


Extras: Filter Print Post Top
Onlinekoods
Ribbit
Male User Gallery


Registered: 05/26/11
Posts: 106,396
Loc: Maryland/DC Burbs
Last seen: 4 minutes, 43 seconds
Re: Im stuck on another chemistry problem [Re: fiddle]
    #19290426 - 12/17/13 08:15 PM (10 years, 2 months ago)

Quote:

fiddle said:
Grams to moles to moles to grams.

It's a stoichiometry and limiting reagents problem. Assuming you have an infinite supply of Al, then O2 becomes your limiting reagent and it simply becomes as stoichiometry problem.

Write out the chemical reaction.

How many moles of O2 do you have per 10g?
How many moles of O2 react per mole of Al?
How many moles of AlO can be produced?
How grams of AlO is that?

Grams to moles to moles to grams.




Except alumina is Al2O3


--------------------
NotSheekle said
“if I believed she was 16 I would become unattracted to her”


Extras: Filter Print Post Top
Invisiblefiddle
Male User Gallery

Folding@home Statistics
Registered: 04/10/08
Posts: 1,769
Loc: PNW
Re: Im stuck on another chemistry problem [Re: koods]
    #19290439 - 12/17/13 08:18 PM (10 years, 2 months ago)

:doh:


--------------------
Tickle my bassline.


Extras: Filter Print Post Top
Invisiblemutantmushroom
The Mutant
Male


Registered: 10/01/13
Posts: 416
Loc: Daytona
Re: Im stuck on another chemistry problem [Re: fiddle]
    #19290445 - 12/17/13 08:20 PM (10 years, 2 months ago)

heres another one i need help with 5 grams of water will make how many Liters of Oxygen at STP


--------------------
When you put the best effort you can into something, you’re bound to get something good out of it



Extras: Filter Print Post Top
OfflineUzziel
O_o


Registered: 12/30/10
Posts: 11,689
Last seen: 4 years, 2 months
Re: Im stuck on another chemistry problem [Re: mutantmushroom]
    #19290467 - 12/17/13 08:26 PM (10 years, 2 months ago)

5g of H2O = ?L O2 at STP

You need to figure out how to do these limiting reagent problems.

So what do you know?

1g of water = 1 mL of water for reference


Extras: Filter Print Post Top
Onlinekoods
Ribbit
Male User Gallery


Registered: 05/26/11
Posts: 106,396
Loc: Maryland/DC Burbs
Last seen: 4 minutes, 43 seconds
Re: Im stuck on another chemistry problem [Re: mutantmushroom]
    #19290484 - 12/17/13 08:32 PM (10 years, 2 months ago)

Oxygen weighs 1.429 g/l at 0°C (STP)

Water is 88.81% oxygen.

5*.8881/1.429 = 3.107 liters


Yeah, OP. You need to learn how to do these. I'm cheating by using the Merck index so I don't have to do all that molar shit.


--------------------
NotSheekle said
“if I believed she was 16 I would become unattracted to her”


Edited by koods (12/17/13 08:33 PM)


Extras: Filter Print Post Top
Invisiblefiddle
Male User Gallery

Folding@home Statistics
Registered: 04/10/08
Posts: 1,769
Loc: PNW
Re: Im stuck on another chemistry problem [Re: mutantmushroom]
    #19290511 - 12/17/13 08:38 PM (10 years, 2 months ago)

Gas law problem, PV=nRT. Grams of H2O to moles of O2, figure out what STP is. Plug and chug.


--------------------
Tickle my bassline.


Extras: Filter Print Post Top
Jump to top Pages: 1


Similar ThreadsPosterViewsRepliesLast post
* Quick chemistry question FirstAvailable 1,519 11 04/01/04 06:14 PM
by FirstAvailable
* Help me with this problem!
( 1 2 all )
Mr. Faggot 1,266 23 09/01/04 06:53 PM
by notapillow
* hookah/oxygen bar
( 1 2 all )
MilkVein 4,808 33 04/27/04 11:45 PM
by Wysefool
* Problems/benefits that come with height
( 1 2 all )
blacksabbathrulz 3,923 22 11/20/03 07:23 PM
by DoctorJ
* Recreational Chemistry gdman 523 0 10/06/04 11:27 AM
by gdman
* Internet problems... Krishna 873 4 02/23/04 05:50 PM
by Karellen
* HELP!! with car problem ShroomyMcPot 1,036 8 04/07/04 11:14 AM
by ShroomyMcPot
* My problems with this country
( 1 2 all )
blacksabbathrulz 2,538 22 11/20/03 10:52 PM
by Anonymous

Extra information
You cannot start new topics / You cannot reply to topics
HTML is disabled / BBCode is enabled
Moderator: Entire Staff
544 topic views. 5 members, 33 guests and 24 web crawlers are browsing this forum.
[ Show Images Only | Sort by Score | Print Topic ]
Search this thread:

Copyright 1997-2024 Mind Media. Some rights reserved.

Generated in 0.025 seconds spending 0.006 seconds on 12 queries.