Question

A solution contains 0.0653g of compound in 8.31g of ethanol. The molarity of the solution is 0.0368m. Calculate the molecular weight of the compound


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Chemisty - drbob222, Thursday, February 7, 2008 at 9:40pm
The molarity of the solution can't be 0.0368 m. It can be 0.0368 molar or it can be 0.0368 molal. Which is it.

I think you MUST have meant molality.
molality = mols/kg solvent
0.0368 m = mols/0.00831 kg.
Solve for mols = 0.0368 x 0.00831
mols = g/molar mass
You know mols and g, solve for molar mass.

so i got 0.0368 x 0.00831 = 3.06 x 10^-4
and the molar mass of ethanol is 46 grams

so can some one help me in where to plug these in right please

Answer 1

3.06 10^-4 is correct for the mols.
mols = g/molar mass.
You know mols and you know grams. Solve for molar mass of the unknown compound. (Ethanol is the solvent, not the unknown.

Answer 2

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