A solution of pentane and ethanol (CH3CH2OH) that is 75% pentane by mass is boiling at 46.5 °C. The vapor is collected and cooled until it condenses to form a new solution. Calculate the percent by mass of pentane in the new solution. Normal boiling point Density Vapour pressure at 46.5°C
Pentane 36 0.63g/mol 1050 torr
Ethanol 78 0.79g/mol 204 torr

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.

b.

the accuracy of the data.

the answer is c. nacl