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Connor22 · 23rd May 2010, 10:37 AM

Ok now I'm confused, doing chemistry homework, is it RAM over Mass or the other way round I dunno (for finding how many moles there are)

Phenol · 23rd May 2010, 10:46 AM

moles = mass/molar mass

Connor22 · 23rd May 2010, 10:50 AM

bugger

Phenol · 23rd May 2010, 10:56 AM

It's quite simple if you just remember that you're dividing the mass of what you have by the mass for one mole, hence finding how many moles there are. For example if you have 18 grams of water, which contains two hydrogen atoms with r.a.m of 1 each, so 2 in total and an oxygen atom, with r.a.m of 16, giving a total r.a.m for water of 18 grams, the number of moles = 18grams of water/18grams per mole of water = 1, so there is one mole in total.

Connor22 · 23rd May 2010, 11:41 AM

no no I get all that it's just I kept getting those two mixed up and getting confusing answers but I think I've got it now

ANightDude · 23rd May 2010, 12:14 PM

Funny, we're doing the exact same thing in school. We've been doing it all year too, and I JUST figured it out.

And next week, school ends. :l

Connor22 · 23rd May 2010, 12:21 PM

that kinda sucks but I've got exams comin up and I need to know this plus if I don't get this homework right I will be shot

fallendream · 23rd May 2010, 01:03 PM

I swear you were in year 10? We don't do molars or whatever the heck they are yet

23rd May 2010, 01:24 PM

Moles argh. Could never ever get my head around them.

23rd May 2010, 06:35 PM

What did Avogadro teach his students in math class?

Moletiplication

my chem teacher always told mole jokes. they're hilariously tacky. oh but i do hate chemistry.

Phoenix · 23rd May 2010, 06:40 PM

So I won't lie, I thought this was going to be about the animal. I was like what an odd thread.

Zumbro · 23rd May 2010, 09:09 PM

An easy way to solve the issue is to use units. mass (g) / molar mass (g/mol). The grams cancel out, and you're left with moles.

My chemistry teacher took off points for not using units for just this reason. If you use units, and they don't work out in the end, you know you've done something wrong. If you just use numbers, and tack on the correct unit assuming you're right, how do you know if you've missed something?

24th May 2010, 11:53 AM

Quote:

Originally Posted by Zumbro

An easy way to solve the issue is to use units. mass (g) / molar mass (g/mol). The grams cancel out, and you're left with moles.

My chemistry teacher took off points for not using units for just this reason. If you use units, and they don't work out in the end, you know you've done something wrong. If you just use numbers, and tack on the correct unit assuming you're right, how do you know if you've missed something?

ah same with my teacher, although remember that they're all technically fractions; even the measurements like grams because its mass (g)/1 so that you don't forget that the (g) part of the molar mass will have to go in the denominator in order for them to cancel out, or you will have to put another conversion in between those two parts. if you work with fractions like this, you will always know when you're done because there will only be one label left in the equation (or possibly two that combine into one kind of measurement)

and the reason i hate chemistry is because that is one of the more simple concepts

23rd May 2010, 10:37 AM	#1
Connor22 Stopped being (as) vague Full Member Gender: yes Orientation: up the bender Out Status: burned Narnia :D Location: Norn Iron Age: 17 Posts: 1,547 Join Date: Nov 2009	Moles Ok now I'm confused, doing chemistry homework, is it RAM over Mass or the other way round I dunno (for finding how many moles there are) __________________ Kindness is a gift. Share it.

23rd May 2010, 10:46 AM	#2
Phenol Newbie Regular Member Gender: Female Orientation: Gay Posts: 2 Join Date: Mar 2010	Re: Moles moles = mass/molar mass

23rd May 2010, 10:50 AM	#3
Connor22 Stopped being (as) vague Full Member Gender: yes Orientation: up the bender Out Status: burned Narnia :D Location: Norn Iron Age: 17 Posts: 1,547 Join Date: Nov 2009	Re: Moles bugger __________________ Kindness is a gift. Share it.

23rd May 2010, 10:56 AM	#4
Phenol Newbie Regular Member Gender: Female Orientation: Gay Posts: 2 Join Date: Mar 2010	Re: Moles It's quite simple if you just remember that you're dividing the mass of what you have by the mass for one mole, hence finding how many moles there are. For example if you have 18 grams of water, which contains two hydrogen atoms with r.a.m of 1 each, so 2 in total and an oxygen atom, with r.a.m of 16, giving a total r.a.m for water of 18 grams, the number of moles = 18grams of water/18grams per mole of water = 1, so there is one mole in total.

23rd May 2010, 11:41 AM	#5
Connor22 Stopped being (as) vague Full Member Gender: yes Orientation: up the bender Out Status: burned Narnia :D Location: Norn Iron Age: 17 Posts: 1,547 Join Date: Nov 2009	Re: Moles no no I get all that it's just I kept getting those two mixed up and getting confusing answers but I think I've got it now __________________ Kindness is a gift. Share it.

23rd May 2010, 12:14 PM	#6
ANightDude EC's Film Moron Full Member Gender: Male Orientation: Gay Out Status: Out to everyone Location: San Antonio, Texas Age: 17 Posts: 1,848 Join Date: May 2008	Re: Moles Funny, we're doing the exact same thing in school. We've been doing it all year too, and I JUST figured it out. And next week, school ends. :l __________________ "Those who deny freedom to others deserve it not for themselves." -- Abraham Lincoln

23rd May 2010, 12:21 PM	#7
Connor22 Stopped being (as) vague Full Member Gender: yes Orientation: up the bender Out Status: burned Narnia :D Location: Norn Iron Age: 17 Posts: 1,547 Join Date: Nov 2009	Re: Moles that kinda sucks but I've got exams comin up and I need to know this plus if I don't get this homework right I will be shot __________________ Kindness is a gift. Share it.

23rd May 2010, 01:03 PM	#8
fallendream EC Addict Full Member Gender: manlyman, hwar! Orientation: i have a floppy wrist? Out Status: i left aslan... Age: 17 Posts: 945 Join Date: Jan 2009	Re: Moles I swear you were in year 10? We don't do molars or whatever the heck they are yet __________________ [seanathon] 1:09 am: You think I'm not naked? [seanathon] 1:09 am: I've got an ice pack tied to my head using socks.

23rd May 2010, 01:24 PM	#9
Jiggles Guest Posts: n/a	Re: Moles Moles argh. Could never ever get my head around them.

23rd May 2010, 06:35 PM	#10
paco Guest Posts: n/a	Re: Moles What did Avogadro teach his students in math class? Moletiplication my chem teacher always told mole jokes. they're hilariously tacky. oh but i do hate chemistry.

23rd May 2010, 06:40 PM	#11
Phoenix EC Addict Full Member Gender: Male Orientation: Somewhere between gay and bisexual Out Status: Very Location: Massachusetts, USA Posts: 755 Join Date: Sep 2009	Re: Moles So I won't lie, I thought this was going to be about the animal. I was like what an odd thread.

23rd May 2010, 09:09 PM	#12
Zumbro EC Addict Full Member Gender: Male Orientation: 5/6 on the Kinsey scale. Out Status: Out to everyone Location: Troy, NY Age: 22 Posts: 434 Join Date: Jan 2010	Re: Moles An easy way to solve the issue is to use units. mass (g) / molar mass (g/mol). The grams cancel out, and you're left with moles. My chemistry teacher took off points for not using units for just this reason. If you use units, and they don't work out in the end, you know you've done something wrong. If you just use numbers, and tack on the correct unit assuming you're right, how do you know if you've missed something? __________________ If you want to love the world again, you can't just sit back and wait for it. You have to go chase it, and it will be entirely worth it when you catch up.

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