A 1.50 g of heptane (C₇H₁₆) with a vapor pressure of 35.5 torr at 20.0 °C is placed in a 2.50 L vessel at 20.0 °C. Assume that the vessel is closed and the volatile substance has reached equilibrium with its vapor, how much liquid heptane (in grams) is left?

Determine the vapor pressure in mmHg for CBr₄ at 178 °C using the following information.

normal boiling point = 189.5 °C 

∆H_vap = 48.2 kJ/mol

Fluoroform (CHF₃) has a vapor pressure (P_vap) of 1605 mmHg at –68.0°C. If the ΔH_vap of fluoroform is 16.7 kJ/mol, calculate its ΔS_vap.

Toluene, C₇H₈, is an organic solvent used in paint thinners and markers. Its vapor pressure (P_vap) at 31.8°C and 40.3°C are 40.0 mmHg and 60.0 mmHg respectively. Using this information, estimate the normal boiling point of toluene in °C.

Cesium iodide, CsI, is commonly used as a scintillator in experimental particle physics. The table below lists the vapor pressure of solid CsI at several temperatures. Use the Clausius-Clapeyron equation to calculate the enthalpy of sublimation of CsI.