Question

calculate the vapour pressure of 10% Equus glucose solution at 30°C if vapour pressure of pure water is 31.8 MM

Answer 1

$\Delta p=\frac{nb}{na}\times pa$

pa=31.8

10% - 10 g solute in 90 g water

$nb=\frac{m}{M}=\frac{10}{180}=0.056$

$na=\frac{m}{M}=\frac{90}{18}=5$

$\Delta p=\frac{0.056}{5}\times31.8=0.356$