Which of the following Substances would have the highest vapor pressure at 298 K?
A) propanol (b. p.= 97 °C)
B) acetone (b. p.=56°C)
C) benzene (b. p. = 80°C)
D) chloroform (b. p. = 61°C)

B

Explanation:Because acetone has the lowest boiling point of the options given,it also has the weakest intermolecular forces and will therefore have the highest vapor pressure

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm