we make a solution of water and ethylene glycol c2h4(oh)2 which contains 24 g of the glycol for each 74 g of water. What is the boiling point of ethylene?
To determine the boiling point of ethylene glycol, we need to calculate the molarity of the solution and then use the calculation to find the boiling point elevation caused by the presence of ethylene glycol.
First, let's calculate the moles of ethylene glycol (C2H4(OH)2) and water (H2O) in the solution.
For ethylene glycol:
Molar Mass of C2H4(OH)2 = (2*12.01) + (4*1.01) + (2*16.00) = 62.07 g/mol
Mass of ethylene glycol = 24 g
Number of moles of ethylene glycol = Mass / Molar Mass
= 24 g / 62.07 g/mol
≈ 0.3866 mol
For water:
Molar Mass of H2O = (2*1.01) + (16.00) = 18.02 g/mol
Mass of water = 74 g
Number of moles of water = Mass / Molar Mass
= 74 g / 18.02 g/mol
≈ 4.1076 mol
Now, calculate the molality (moles of solute per kilogram of solvent):
Molality of ethylene glycol = Number of moles of ethylene glycol / Mass of water (in kg)
= 0.3866 mol / 4.1076 kg
≈ 0.094 mol/kg
Next, we need to calculate the boiling point elevation using the formula:
ΔT = Kb * m
where ΔT is the boiling point elevation, Kb is the molal boiling point elevation constant, and m is the molality of the solution.
The molal boiling point elevation constant (Kb) for water is approximately 0.512 °C/molal.
ΔT = 0.512 °C/molal * 0.094 mol/kg
≈ 0.048 °C
Finally, we can find the boiling point of ethylene (which is the boiling point elevation added to the boiling point of pure water). The boiling point of pure water at standard conditions is 100 °C.
Boiling point of ethylene = Boiling point of water + ΔT
= 100 °C + 0.048 °C
≈ 100.048 °C
Therefore, the boiling point of ethylene glycol (C2H4(OH)2) is approximately 100.048 °C.
#1. You need to find the caps key and use it.
2. You need to proof you post. "What is the boiling point of ethylene---I assume you meane ethylene glycol".
mols ethylene glycol = grams/molar mass = ?
kg solve is 0.074 kg
delta T = Kb*m with Kb approx 0.5 but that an estimate.
Then add delta T to the normal boiling point of H2O to find the new boiling point.