What is the vapor pressure of SiCl4 in mm Hg at 30.0 °C? (See Problem 11.27.)

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Step 1: Look up the problem 11.27. It should provide you with the necessary information to solve this problem. This could be a table of vapor pressures at different temperatures, or a formula to calculate vapor pressure.

Step 2: If you are given a table of vapor pressures, find the value corresponding to 30.0 °C. If you are given a formula, substitute the given temperature into the formula.

Step 3: If you are using a formula, make sure to convert the temperature from Celsius to Kelvin, as most formulas use the Kelvin scale. The conversion is K = °C + 273.15.

Step 4: If the formula you are using is the Clausius-Clapeyron equation, it will look something like this: ln(P2/P1) = -ΔHvap/R (1/T2 - 1/T1). Here, P2 is the vapor pressure at temperature T2, P1 is the vapor pressure at temperature T1, ΔHvap is the heat of vaporization, and R is the ideal gas constant.

Step 5: Solve the equation or look up the table to find the vapor pressure of SiCl4 at 30.0 °C. Remember, the answer should be in mm Hg.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Vapor Pressure

Vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid or solid phase at a given temperature. It reflects the tendency of particles to escape from the liquid or solid state into the gas phase. Higher temperatures generally increase vapor pressure, as more molecules have sufficient energy to overcome intermolecular forces.

Temperature and Vapor Pressure Relationship

The relationship between temperature and vapor pressure is described by the Clausius-Clapeyron equation, which shows that as temperature increases, vapor pressure also increases. This is due to the increased kinetic energy of molecules at higher temperatures, leading to a greater number of molecules transitioning into the vapor phase. Understanding this relationship is crucial for predicting vapor pressures at different temperatures.

SiCl4 Properties

Silicon tetrachloride (SiCl4) is a chemical compound that exhibits specific physical properties, including its vapor pressure at various temperatures. Knowing the vapor pressure of SiCl4 at a given temperature, such as 30.0 °C, is essential for applications in chemical processes and safety assessments. Reference data or experimental values are often used to determine these properties.

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