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klasskru [66]
3 years ago
13

What is the vapor pressure of a 45.0 % solution of glucose, c6h12o6, at 90.0°c, given that the vapor pressure of pure water at t

hat temperature is 526 mm hg?
Chemistry
1 answer:
Vadim26 [7]3 years ago
7 0
Weight of solute = 45 g and weight of solvent = 55 g
M.wt of solute = 180      P⁰ = 526 mmHg
number of moles of solute = 45 / 180 = 0.25 mol
number of moles of solvent = 55 / 18 = 3.05 mol
According to Rault's law:
\frac{P^{0} - P^{s}  }{P^{0} }  =  \frac{n_{solute} }{n_{solute} + n_{solvent}} = 0.25 / (0.25 + 3.05)

\frac{526 - P^{s} }{526} = 0.076

P^{s} = 486.15 mmHg
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