Question

Determine the moles of solute in a 350g solution that is 2.5 molal.

Answer 1

0.875 moles solute

Step-by-step explanation:

You can find the moles of the solute using the molality ratio:

Molality = moles solute / mass (kg) solution

After converting the mass to kilograms, you can plug the values into the ratio and simplify to find the moles.

1,000 g = 1 kg

350 g 1 kg
-------------- x --------------- = 0.35 kg solution
1,000 g

Molality = moles solute / mass solution

2.5 m = moles solute / 0.35 kg

0.875 = moles solute