# Clausius-Clapeyron equatioin's constant for methanol

• connard
In summary, the Clausius-Clapeyron equation is used to describe the relationship between temperature and pressure for a given material. The constants A and C depend on the material and conditions such as temperature and pressure. They can be found using steam tables for water. The equation states that log P and 1/T are linear, allowing for interpolation of data.
connard
Hi everyone!
I'm searching for the constants in Clausius-Clapeyron equation

lnP=A-C/T

I'ld like to know the value of A and C. (for Pressure unity is hPa and Temperature is K )

Thanks

connard said:
Hi everyone!
I'm searching for the constants in Clausius-Clapeyron equation

lnP=A-C/T

I'ld like to know the value of A and C. (for Pressure unity is hPa and Temperature is K )

Thanks
They depend on the material under consideration, and on conditions like temperture and pressure. For water you could look at some steam tables. What the equation says is that log P and 1/T are linear as a 1st approximation. The equation can be used to interpolate a data set. Ie you know P(T) for water in 5 K increments from 273 to 373 and want to know P(300.62).

for your question! The Clausius-Clapeyron equation is used to describe the relationship between temperature and vapor pressure for a substance. The constants A and C in the equation are specific to the substance in question. In this case, you are looking for the constants for methanol. The values for A and C can be found in thermodynamic tables or calculated using experimental data. According to the NIST Chemistry Webbook, the values for A and C for methanol are approximately 16.436 and 5074.8, respectively, when pressure is in hPa and temperature is in K. However, it is important to note that these values may vary slightly depending on the specific experimental conditions and data used. I hope this helps!

## What is the Clausius-Clapeyron equation's constant for methanol?

The Clausius-Clapeyron equation's constant for methanol, also known as the vapor pressure constant, is a thermodynamic property that relates the temperature and vapor pressure of a liquid. It is denoted by the symbol C and has a value of approximately 7.87 kPa/K at room temperature.

## How is the Clausius-Clapeyron equation's constant for methanol calculated?

The Clausius-Clapeyron equation's constant for methanol can be calculated by taking the natural logarithm of the ratio of the vapor pressure of methanol at two different temperatures, divided by the difference in temperature between those two points. This calculation is typically done using experimental data or through theoretical calculations based on the properties of the substance.

## What is the significance of the Clausius-Clapeyron equation's constant for methanol?

The Clausius-Clapeyron equation's constant for methanol is important because it allows us to understand and predict the behavior of the substance at different temperatures and pressures. It is particularly useful in studying phase transitions, such as the boiling and condensation of methanol, and can also be used to determine the enthalpy of vaporization for the substance.

## How does the Clausius-Clapeyron equation's constant for methanol compare to other substances?

The Clausius-Clapeyron equation's constant for methanol is relatively high compared to other substances, indicating that it has a strong tendency to vaporize at a given temperature. This is due to the relatively weak intermolecular forces present in methanol, which allow it to transition between the liquid and vapor phases more easily.

## What are some potential sources of error when determining the Clausius-Clapeyron equation's constant for methanol?

Some potential sources of error when determining the Clausius-Clapeyron equation's constant for methanol include experimental errors, such as inaccuracies in temperature and pressure measurements, and assumptions made in the theoretical calculations. Additionally, the constant may vary slightly depending on the purity and composition of the methanol sample being studied.

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