Mass (1 Viewer)

[Tommy_Lamp]

Do you have mass in grams or kilograms always?

 

[wind]

When playing around with moles (not them blind, furry things...) it's in grams, but SI units are kilograms... ummm lol

 

[Managore]

uhh I think grams is the way to go, that and ....mL or L? dammit now I'm confused

 

[Plebeian]

Always use L, I think.

 

[Tommy_Lamp]

thanks

yes its L because its mol L-1

 

[wind]

We still dunno whether it's grams or kilograms

 

[helper]

For moles its grams

For specific heat if you are using the boards value it is kg to obtain an answer in Joules

If you use grams for specific heat then you need to divide by 1000 or your results are in KJ.

For molarity you use Litres.

To convert volume into grams then use 1 g = 1 mL or 1kg =1L

For gas laws its litres

So it depends on what you are doing.

 

[Plebeian]

The specific heat value for water published on the data sheet includes a "per kg" in it, so that shouldn't be too hard to remember.

 

[Tommy_Lamp]

i change the specific heat capacity of water to g, making it 4.18 even, good since water is generally in mL's also, not L

 

[Paroissien]

As do I. Makes the whole thing a lot easier

 

[Kazuya]

titration calculation (C1V1 = C2V2) is in mL isn't it? Or Litres?

I get so confused sometimes

 

[aim54x]

mass in chem is grams. we use avagadros number to give number of atoms in a sample of the element with its atomic mass in grams.

that is not as easy as i thought to explain in words

 

[helper]

Doesn't matter as long as you are consitent.
Technically it should be Litres

 

[Tommy_Lamp]

Depends on what the volume of the solutions is given in, generally mL, but if both are mL's then it doesnt matter, same as if both are L. The ratio is the same.

 

[Managore]

waaaa I hate chemistry! Too much nonsensical crap to remember

 

[jumb]

To convert volume into grams then use 1 g = 1 mL or 1kg =1L

Except when you're doing the 1M = 24. L volume thing.

 

[Xayma]

SI units should always be used.

The only time you don't is for the mole conversion.

1kg=1L is only for water at 4°C

Strictly speaking L isn't an SI unit.

But otherwise yes.

Since conc is mol L^-1.

SI Units are (the basics):
metres
seconds
candelra
Kelvin
Ampere
kilogram
Mole

 

[Tommy_Lamp]

SI units are kg and L?