Posted by **Fai** on Sunday, August 19, 2012 at 8:07pm.

What is the molarity of 100ml of ethanol dissolved in 1.5L of water? Ethanol has a specific of 0.789, and its molecular weight is 46g/mol.

My calculation

0.789 x 1.5L = 1.1184

1.184/46g = 0.025

x= 26M

I am not sure answer. Pls help

- chemistry -
**DrBob222**, Sunday, August 19, 2012 at 9:00pm
M = mols/L soln

How much does 100 mL ethanol weigh? That is m = v x d = 100 mL x 0.789 g/mL = 78.9g and that is 78.9/46 = 1.715 mols.

So 1.715 mol/L soln is molarity. Your problem has the ethanol dissolved in 1.5 L so the final solution is 1.5L + 0.100L IF (and it's a big if) the volumes are additive. They aren't but the only way we can finsh the problem is to assume they ARE additive. Therefore, 1.5L H2O + 0.100 L ethanol adds to make 1.6L of solution if the solutions are additive.

Then 1.715/1.6L = ? molarity.

## Answer this Question

## Related Questions

chemistry - What is the molarity of 100 ml of ethanol dissolved in 1.5 liters of...

math - what is the mass of 1.00 L of ethanol? Ethanol has a density of 0.798 g/...

chem 101 - 60F is 15.55 C 180 F is 82.22C delta T = 82.22-15.55 = 66.67 q = mass...

Chemistry - How much heat is required to convert 32.5 grams of ethanol at 28 C ...

CHEMISTRY - You mix 40.0 g of ethanol (C2H5OH, molecular weight = 46.1 g/mol) ...

chemistry - What is the mass/vol % ethanol in an ethanol-water solution with ...

chemistry - Calculate the molarity and mole fraction of a 2.35 m solution of ...

chemistry - What is the mass percent of a solution if 42.9 grams of aspirin is ...

chemistry - What is the mass percent of a solution if 42.9 grams of aspirin is ...

chemistry - A 52.3 kg sample of ethanol is needed for a reaction. What volume in...