Question

The density of a 22.0% by mass ethylene glycol (c2h6o2) solution in water is 1.04 g/ml . part a find the molarity of the solution.

Answer 1

Answer:- 3.68M.

Solution:- We have a 22.0% by mass solution of ethylene glycol and it's density is 1.04 gram per mL. It ask to calculate the molarity of the solution. We know that molarity is moles of solute per liter of solution. So, we need to figure out the moles of ethylene glycol and volume of solution.

Let's say we have 100 grams of the solution. Then mass of ethylene glycol would be 22.0 grams. Molar mass of ethylene glycol is 62.07 gram per mol.

Let's calculate it's moles first:

$22.0gC_2H_6O_2(\frac{1mol}{62.07g})$

= $0.354molC_2H_6O_2$

From mass and density we calculate the volume of the solution and convert it to liters as:

$100g(\frac{1mL}{1.04g})(\frac{1L}{1000mL})$

= 0.0962 L

$molarity=\frac{0.354mol}{0.0962L}$

= 3.68M

So, the molarity of ethylene glycol solution is 3.68M.