Hi there,

I've been trying to solve this problem and just when I thought I had the solution, turns out I didn't.

This is the problem:

I have a bottle with 81% (v/v) of a liquid. 1 liter of the liquid weighs 1.305 kg. The molecular weight of the liquid is 89.9. What is the concentration in mol/L of this liquid?

And then the same question for w/w and w/v instead of v/v.

My thoughts:

v/v: 0.81 liters per liter, so 0.81 * 1.305 = 1.06 kg per liter. 1060/89.9 = 11.76 moles/liter.

w/v: 81 grams per 100 mL, so 810 grams per liter. 810/89.9 = 9.01 moles/liter.

w/w: 81 grams per 100 grams, so 810 grams per kg, which means 810 grams per 0.77 liter, which gives 1060 grams per 1 liter. 1060/89.9 = 11.76 moles/liter.

However, now I have the same solution for v/v and w/w, and I don't think that can be right... I feel like I'm missing some information in the problem, but it should be solveable...

Any help would be greatly appreciated!

I've been trying to solve this problem and just when I thought I had the solution, turns out I didn't.

This is the problem:

I have a bottle with 81% (v/v) of a liquid. 1 liter of the liquid weighs 1.305 kg. The molecular weight of the liquid is 89.9. What is the concentration in mol/L of this liquid?

And then the same question for w/w and w/v instead of v/v.

My thoughts:

v/v: 0.81 liters per liter, so 0.81 * 1.305 = 1.06 kg per liter. 1060/89.9 = 11.76 moles/liter.

w/v: 81 grams per 100 mL, so 810 grams per liter. 810/89.9 = 9.01 moles/liter.

w/w: 81 grams per 100 grams, so 810 grams per kg, which means 810 grams per 0.77 liter, which gives 1060 grams per 1 liter. 1060/89.9 = 11.76 moles/liter.

However, now I have the same solution for v/v and w/w, and I don't think that can be right... I feel like I'm missing some information in the problem, but it should be solveable...

Any help would be greatly appreciated!

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