You are going to prepare a silicone polymer, and one of the starting materials is dichlorodimethylsilane, SiCl₂(CH₃)₂. You need its normal boiling point and to measure equilibrium vapor pressures at various temperatures.

(a) What is the normal boiling point of dichlorodimethylsilane?
(b) Plot these data as ln P versus 1/T so that you have a plot resembling the one in Figure 11.13. At what temperature does the liquid have an equilibrium vapor pressure of 250 mm Hg? At what temperature is it 650 mm Hg?
(c) Calculate the molar enthalpy of vaporization for dichlorodimethylsilane using the Clausius– Clapeyron equation.

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Temperature (°C) Vapor Pressure (mm Hg) 40. 100. 400. 760. -0.4 +17.5 51.9 70.3