The vapor pressure of benzene at 20 °C is 75 torr while that of chloroform is 160 torr. Calculate the vapor pressure of the solution prepared by dissolving equal amounts (in moles) of the two liquids at 20 °C. Assume ideal behavior.

• A. 235 torr
• B. 117.5 torr
• C. 197.5 torr
• D. 155 torr

Answer: (B)