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/sci/ - Science & Math

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2450259 No.2450259 [Reply] [Original]

How do you convert from litres to moles. I cannot find the density anywhere on the periodic table or listed in the class notes. is there something im missing here, or is my teacher an ill prepared bitch

>> No.2450261

A litre of what?

>> No.2450269

NO2

>> No.2450270
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2450270

>convert from litres to moles
wtf? they are not equal unit states
thats like asking how to convert from farads to kilograms
it makes no sense.

>> No.2450272

Yeah, density is required. She could be unprepared or could be making a really sneaky subtle reference somewhere. Or she may expect you to know the density of a particular substance.

>> No.2450279

>>2450272

Assuming std. pressure temp etc, isnt it around 22,5 mol/liter ?

>> No.2450284
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2450284

>> No.2450288

>>2450270

um, it's a gas...ofcourse you can count litres to moles...if it's NTP ofcourse :)

>> No.2450301

>>2450259

>>2450275

the cost of tutors must be sky high - how about /sci/ starts charging the lame and lazy for answers to their homework?

>> No.2450330

>>2450279
Uhhhh I believe you're right, yes.

Thank you.

(this is why I'm not in chem)

>> No.2450338

>>2450301
There is a difference between an answer and a formula. Its not like people are asking us to do it for them, they just want help. But I do agree, a flat rate of 10$ a question would work nicely

>> No.2450372

Didn't you get a little book with info like that when you joined the subject? We use a 100 page thick book full of tables that show constants and some other useful crap. You're allowed to use it during exams like a dictionary too, which is great.

>> No.2450381

Sadly we did not get any form of book. the teacher decides to teach on the instant and we write our own notes, today was the first class she did not cover this b ecause she lost her note sheet

>> No.2450416

I'm pretty sure you can just use C=n*v

Just isolate n=v/C

You need concentration though....

>> No.2450558

Ideal gas law friend

PV=nRT

>> No.2450586

unless of course you are in a college pchem or chemical engineering class, but i assumed high school or chem 101

it doesn't matter what the gas is, and like someone said 22.5mol/L at stp

>> No.2450590

>>2450586
>>2450279
What is the point of remembering 22.5 instead of the correct value (22.4)? It's not like it has any less decimals...

>> No.2450598

>>2450279

I just went full retard and mixed shit up. Sorry OP.

One mole is 22.4 liters, not the other way around, so 1 liter has 1/22,4 = 0,04 moles = 44,64 mmoles

>> No.2450681

>>2450586

my bad on mol/L too and 22.4L/mol, I wasn't thinking I would have just did the equation if it was my homework

>> No.2450693

>>2450590
>>2450598
My bad yeah 22.4 L/mol, I would have just done the equation if this was my homework