Answer:
Molality is 2.76 m/kg
Explanation:
First of all, determinate the moles of solute by dividing mass / molar mass
Molar mass diethyl ether = 74.12 g/m
86.9 g / 74.12 g/m = 1.17 moles
This moles of solute, are in 425 grams of benzene (solvent)
Molality means, the moles of solute which occupy 1kg of solvent.
425 g = 0.425 kg
1.17 m / 0.425 kg = 2.76 m
Answer:
The molality of this solution is 2.75 molal
Explanation:
Step 1: Data given
Mass of diethyl ether = 86.9 grams
Mass of benzene = 425 grams = 0.425 kg
Step 2: Calculate moles of solute
Molality = moles of solute/kg of solvent
Molar mass of C4H10O =
4* molar mass carbon + 10* molar mass hydrogen + molar mass of oxygen
molar mass C4H10O = 74.12 g/mol
Moles solute( C4H10O) = 86.9 grams / 74.12 g/mol
Moles C4H10O = 1.17 moles
Step 3: Calculate molality
Molality = 1.17 moles of C4H10O / 0.425 kg of C6H6
Molality = 2.75 mol/kg = 2.75 molal
The molality of this solution is 2.75 molal
