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number of moles in br2 solution

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yitzik:
hello!
how can i calculate the number of moles of br2 in a solution of 10% (by mass) of br2 in  dichloromethane?
there is no available data about the density of such a solution, so how can i deduce it's molarity?
what is the right way to solve it?

thanks!

Orcio_87:
1. Find the density of 10 % (by weight) solution of Br2 in CH2Cl2.
2. Calculate mass of 1000 ml of this solution.
3. Divide quantity (number of moles) of Br2 per volume of the solution (1 liter).

Borek:

--- Quote from: yitzik on July 22, 2021, 02:50:37 PM ---there is no available data about the density of such a solution, so how can i deduce it's molarity?
--- End quote ---

You can't.

yitzik:

--- Quote from: yitzik on July 22, 2021, 02:50:37 PM ---how can i calculate the number of moles of br2 in a solution of 10% (by weight) of br2 in  dichloromethane?

--- End quote ---
i'm asked to find the number of moles in 30 ml of such a solution, so there must be a way to do this..
maybe there is a way to calculate the average density of the two substances? or weighted mean of the densities or something like that?

if you could please help me
thanks!

Orcio_87:
True, as density of the solution grows linearly with the growth of mass concentration (fits the y = a + bx function).

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