Question

The vapour pressure of the solution $M$ is

• A. 39.3 mm Hg
• B. 36.0 mm Hg
• C. 29.5 mm Hg
• D. 28.8 mm Hg

Answer 1

Vapour pressure $=p(H_{2}O)+p$ (ethanol)
$=32.8\times 0.1+40\times 0.9$
$=3.28+36$
$=39.28mm$