A solution consists of 45.50g naphthalene (a non-volatile compound, MW=128.17g/mol) dissolved in 50.00g of ethanol (MW=46.02g/mol)....
A solution consists of 45.50g naphthalene (a non-volatile compound, MW=128.17g/mol) dissolved in 50.00g of ethanol (MW=46.02g/mol). The vapor pressure of pure ethanol at 25.0°C is 96.0 mmHg. What is the vapor pressure of the solution at 25.0°C?
Homework Answers
The vapor pressure of ethanol = 96.00 mm Hg
Moles of naphthalene = mass / molar mass
= 45.50 g/ 128.17 g/mol
= 0.355 moles
Mass of ethanol = 50 g
Moles = 50 g / 46.02 g/mol
= 1.086 moles
The mole fraction of ethanol = moles of ethanol / total moles
= 1.086moles / 1.441 moles
= 0.754
The vapor pressure of solution with a nonvolatile solute
= Pure vapor pressure * mole fraction of solvent
= 96 mm Hg * 0.754
=72.38 mm Hg
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A solution consists of 45.50g naphthalene (a non-volatile
compound, MW=128.17g/mol) dissolved in 50.00g of ethanol
(MW=46.02g/mol)....
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