# Is a mole (mol) a base unit or a dimensionless quantity?

Watch
Announcements

Page 1 of 1

Go to first unread

Skip to page:

Report

#2

(Original post by

Is confusion to me.

**Mullah.S**)Is confusion to me.

http://en.wikipedia.org/wiki/SI_base_unit

0

reply

Report

#3

A mole is just a number. It is the number of molecules that is equal in mass (in grams) to it's relative molecular mass.

e.g. 1 mole of 12C (carbon-12 isotope) atoms is equal to 12 grams.

This number is known as Avagadro's constant.

e.g. 1 mole of 12C (carbon-12 isotope) atoms is equal to 12 grams.

This number is known as Avagadro's constant.

0

reply

Report

#4

(Original post by

A mole is just a number. It is the number of molecules that is equal in mass (in grams) to it's relative molecular mass.

e.g. 1 mole of 12C (carbon-12 isotope) atoms is equal to 12 grams.

This number is known as

**JMaydom**)A mole is just a number. It is the number of molecules that is equal in mass (in grams) to it's relative molecular mass.

e.g. 1 mole of 12C (carbon-12 isotope) atoms is equal to 12 grams.

This number is known as

**Avagadro**'s constant.(edit)

Lorenzo Romano Amedeo Carlo Avogadro di Quaregna e di Cerreto would turn in his grave ....

4

reply

Report

#5

(Original post by

Is sounding like mere mark scoring definition, i am wanting know whether is dimensionless quantity or a base unit.

thank you anyway

**Mullah.S**)Is sounding like mere mark scoring definition, i am wanting know whether is dimensionless quantity or a base unit.

thank you anyway

0

reply

Report

#6

(Original post by

Is confusion to me.

**Mullah.S**)Is confusion to me.

0

reply

(Original post by

According to SI it is a base (fundamental) unit

http://en.wikipedia.org/wiki/SI_base_unit

**charco**)According to SI it is a base (fundamental) unit

http://en.wikipedia.org/wiki/SI_base_unit

ok thanks.

But my question is being, if is base unit and not dimensionless quantity, is meaning it is having dimension. What is the dimension of the base unit mole? (i.e what is the base quantity)

(Original post by

I wrote that it is a base unit in my post above!

**charco**)I wrote that it is a base unit in my post above!

to much mozart

0

reply

(Original post by

It's just an amount of something.

**The_Last_Melon**)It's just an amount of something.

what does amount meaning if it is not dimensionless quantity?

0

reply

Report

#10

(Original post by

what does amount meaning if it is not dimensionless quantity?

**Mullah.S**)what does amount meaning if it is not dimensionless quantity?

i only did AS chemistry though so take my advice with a pinch of salt

EDIT: also two more things to remember:

1 mole of any substance has a mass equal to the molecular mass of that substance in grams. so 1 mole of carbon (molecular mass 12) has a mass of 12g, 1 mole of CO2 has a mass equal to the molecular mass of carbon + 2* the molecular mass of oxygen in grams.

also I

*think*but i'm not sure that a mole of any gas has the same volume as a mole of any other gas. need someone to confirm this though.

0

reply

Report

#11

It's just a standard unit of measurement. It just lets scientist know how many atoms are in something (usually a solution). It isn't dimensionless, a mole can physically be measured.

Best way to think about it:

There are 6.023 x 10^23 atoms in 1g of hydrogen. Carbon is 12 times heavier than hydrogen so 6.023 x 10^23 atoms in carbon will be 12g. If hydrogen is the standard, the number of grams in a mole of any element can be figured out (14g of nitrogen makes a mole, 16g of oxygen makes a mole etc...)

Best way to think about it:

There are 6.023 x 10^23 atoms in 1g of hydrogen. Carbon is 12 times heavier than hydrogen so 6.023 x 10^23 atoms in carbon will be 12g. If hydrogen is the standard, the number of grams in a mole of any element can be figured out (14g of nitrogen makes a mole, 16g of oxygen makes a mole etc...)

2

reply

(Original post by

It's just a standard unit of measurement. It just lets scientist know how many atoms are in something (usually a solution). It isn't dimensionless, a mole can physically be measured.

Best way to think about it:

There are 6.023 x 10^23 atoms in 1g of hydrogen. Carbon is 12 times heavier than hydrogen so 6.023 x 10^23 atoms in carbon will be 12g. If hydrogen is the standard, the number of grams in a mole of any element can be figured out (14g of nitrogen makes a mole, 16g of oxygen makes a mole etc...)

**Iamyourfather**)It's just a standard unit of measurement. It just lets scientist know how many atoms are in something (usually a solution). It isn't dimensionless, a mole can physically be measured.

Best way to think about it:

There are 6.023 x 10^23 atoms in 1g of hydrogen. Carbon is 12 times heavier than hydrogen so 6.023 x 10^23 atoms in carbon will be 12g. If hydrogen is the standard, the number of grams in a mole of any element can be figured out (14g of nitrogen makes a mole, 16g of oxygen makes a mole etc...)

i was thinking mole is just synonym of avagadro number (which

*is*a dimensionless quantity). so one mole of a thing does not meaning 6.02*10^23 of the things.

0

reply

Report

#13

(Original post by

JMaydom!!!!!

(edit)

Lorenzo Romano Amedeo Carlo Avogadro di Quaregna e di Cerreto would turn in his grave ....

**charco**)JMaydom!!!!!

(edit)

Lorenzo Romano Amedeo Carlo Avogadro di Quaregna e di Cerreto would turn in his grave ....

Cracking full name...

0

reply

Report

#14

(Original post by

Oh, i am thankyou.

i was thinking mole is just synonym of avagadro number (which

**Mullah.S**)Oh, i am thankyou.

i was thinking mole is just synonym of avagadro number (which

*is*a dimensionless quantity). so one mole of a thing does not meaning 6.02*10^23 of the things.Based on what was said just know that 6.022x10^23 (ignore the number I write earlier) atoms is mole.

0

reply

Report

#15

I think it might be dimensionless as a "mole" of something is just 6.02 x 10^-23 of something, it's just a number. And I think it is therefore dimensionless as it's just a number of things.

Like one mole of electrons is 6.02 x 10^-23 electrons, and one mole of hedgehogs is just 6.02 x 10^-23 hedgehogs... It is a SI unit but I believe it is also dimensionless, so it's both.

Like one mole of electrons is 6.02 x 10^-23 electrons, and one mole of hedgehogs is just 6.02 x 10^-23 hedgehogs... It is a SI unit but I believe it is also dimensionless, so it's both.

0

reply

(Original post by

I think it might be dimensionless as a "mole" of something is just 6.02 x 10^-23 of something, it's just a number. And I think it is therefore dimensionless as it's just a number of things.

Like one mole of electrons is 6.02 x 10^-23 electrons, and one mole of hedgehogs is just 6.02 x 10^-23 hedgehogs... It is a SI unit but I believe it is also dimensionless, so it's both.

**holliebass**)I think it might be dimensionless as a "mole" of something is just 6.02 x 10^-23 of something, it's just a number. And I think it is therefore dimensionless as it's just a number of things.

Like one mole of electrons is 6.02 x 10^-23 electrons, and one mole of hedgehogs is just 6.02 x 10^-23 hedgehogs... It is a SI unit but I believe it is also dimensionless, so it's both.

is like saying something is both haraam and halaal at the same time

0

reply

Report

#17

(Original post by

unit and dimensionless are be mutually exclusive

is like saying something is both haraam and halaal at the same time

**Mullah.S**)unit and dimensionless are be mutually exclusive

is like saying something is both haraam and halaal at the same time

"According to the SI, the mole is not dimensionless, but has its very own dimensions, namely "amount of substance", comparable to other dimensions such as mass and luminous intensity"

0

reply

X

Page 1 of 1

Go to first unread

Skip to page:

### Quick Reply

Back

to top

to top