calculate the mole fraction of ethylene glycol in a solution containing 20% of ethylene glycol prepared in water.
answer it as fast as possible.........
Are you talking about 20% w/w/ or 20% w/v? I will assume you mean 20% w/w which means 20 g ethylene gycol in 100 g solution. So that is 20 g ethylene glycol in 80 g H2O.
n H2O = g/molar mass = ?
n ethylene glycol = grams/molar mass = ?
total mols = n H2O + n ethylene gycol
Xeth gly = n eth gly/total mols.
To calculate the mole fraction of ethylene glycol in a solution, we need to know the amount of ethylene glycol and the amount of water in the solution. Given that the solution contains 20% ethylene glycol, we can assume that the remaining 80% is water.
Now, we need to convert the percentage into a decimal fraction.
20% of ethylene glycol = 0.20
80% of water = 0.80
Next, we need to calculate the number of moles of each component. We will use the molar mass of ethylene glycol, which is 62.07 g/mol.
To calculate the number of moles of ethylene glycol, we multiply the percentage of ethylene glycol by the total mass of the solution. Let's assume we have 100 grams of the solution:
Number of moles of ethylene glycol = 0.20 * 100 g / 62.07 g/mol
Now, to calculate the mole fraction, we divide the moles of ethylene glycol by the total moles in the solution:
Mole fraction of ethylene glycol = moles of ethylene glycol / (moles of ethylene glycol + moles of water)