The vapor pressure of liquid butanol,butane,, is 40.0 mm Hg at 326 K. A sample of C4H9OH is placed in closed, evacuated container of constant volume at a temperature of 489 K. It is found that all the C4H9OH is in the vqpor phase and that the pressure is 72.0 mm Hg. If the temperature in the container is reduced to 326 K, which of the following statements are correct? Choose all that apply. The pressure in the container will be 48.0 mm Hg Some of the vapor initially present will condense. Only butanol vapor will be present. No condensation will occur  Liquid butanol will be present

The vapor pressure of liquid diethyl ether, C₂H5OC2H5, is 40.0 mm Hg at 245 K. A sample of C₂H5 OC₂H5 is placed in a closed, evacuated container of constant volume at a temperature of 398 K. It is found that all of the C₂H5OC₂H5 is in the vapor phase and that the pressure is 47.0 mm Hg. If the temperature in the container is reduced to 245 K, which of the following statements are correct? (Select all that apply.) O The pressure in the container will be 40.0 mm Hg. O Liquid diethyl ether will be present. O Only diethyl ether vapor will be present. O Some of the vapor initially present will condense. No condensation will occur.

2. Which one of the following statements is incorrect? (a) According to the Gibbs phase rule, four phases of a pure substance cannot exist (b) All triple points correspond to a gas-liquid-solid equilibrium (c) The triple point in a P-T diagram becomes a triple line in a P-V diagram (d) The chemical potential determines which of several phases is the most stable

he following reaction illustrates the decomposition of hydrogen peroxide (H2O2) to form water and oxygen gas:2 H2O2 (l) → 2 H2O (l) + O2 (g)When this reaction is carried out, 0.50 L of O2 gas is collected over water at a total pressure of 1.05 atm. The temperature is 23°C. The vapour pressure of water at this temperature is 0.0278 atm.What was the mass (in g) of the hydrogen peroxide that decomposed?