# how do you change from gram per dm^3 to mole per dm^3?

Learnt it last year, but i have completely forgotten it! :P Thanks a lot though! :)

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- Lee Wang TuiLv 79 years agoFavorite Answer
Divide it by its molecular mass,

m/V = gram/dm^3

n/V = (m/Mr)/V = mol/dm^3

n = m/Mr

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- UmarLv 79 years ago
Mole per dm3 = wt of given compound/molar mass of the compound. When this amount is dissolved in 1L we have a solution containing 1mole per dm3.

Example a solution containing 25g NaOH/dm3 = 25/40 = 0.625mole NaOH per dm3

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- 9 years ago
I learned factor labeling (i think thts wat its called)

g/dm^3 * mol/g = mol/dm^3

when u multiply by mol/g, the two "g" cancel out. I believe molar mass is g/mol so just multiply by the inverse of that since you want mols on top and the grams to cancel out

Source(s): CHEM AP- Log in to reply to the answers

- Anonymous9 years ago
Idk

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