![]() ![]() NOTE: =ln(a6) tells Excel to take the natural logarithm of the value in cell A6. Select cell D6, type =ln(a6) and press Enter. We now need to calculate the values for the remaining two columns. This will be true for the other cells as well. Excel has automatically changed the cell/value used in the formula from b6 to b7. Notice that the formula for this cell is =B7+273.15, i.e. Excel will automatically copy and paste the formula from C6 to the highlighted cells.Ĭlick on cell C7. Once the block of highlighted cells extends down to, and includes, C12 (see figure opposite) release the mouse button. Move the mouse down, a box will appear around the block of cells that have been highlighted. The Clausius Clapeyron equation for liquid-vapour equilibrium is then used. Let T be the temperature and p be the saturation vapour pressure. Move the cursor over this small square and press and hold the mouse button down. The Clausius Clapeyron equation calculates the rate of increase in vapour pressure per unit increase in temperature. Cell C6 on your worksheet should currently be bordered with a dark line, with a small dark square in the bottom right corner (see figure opposite). However, rather than typing the appropriate formula into every cell, we can get Excel to do this for us. We now need to repeat this calculation for the other temperature values. ![]() If you ever need to edit the cell formula, you can do so by clicking on the relevant part of the formula displayed in the formula box. The formula itself is shown in the box above the columns, next to the = sign. Notice that the calculated value, not the formula, is displayed in the cell. The formula will disappear and be replaced with the calculated value.Ĭlick on cell C6 again. Note 2: Entering b6 causes Excel to use the value it finds in cell B6 when it calculates the value of the formula. Note 1: The = at the start of the entry specifies you are typing a formula, i.e. To calculate the first value in the T / K column, select cell C6 and then type =b6+273.15 Edit your spreadsheet until it appears like the figure opposite. To do this we first label the columns where this transformed data will appear. So we need to calculate ln(P) and 1/RT for each of the data points. Using the integrated form of the Clausius-Clapeyron equation it can be shown that a plot of ln(P) vs 1/RT will be linear. The formula used for calculating vapor pressure given a change in the. Rather than plotting P vs T, we wish to linearise the data, so that the plot will be a straight line. 3 Ways to Calculate Vapor Pressure - wikiHow. Sheet2) in your workbook, enter the data given below, so that it looks like the figure shown. If a mistake in the calculation is made, correcting the error in the affected spreadsheet cell(s) will automatically result in all the calculations being updated rather than having to repeat all the (by hand) calculations.Overall it should work out to be less time consuming than performing them by hand. ![]() R - Gas Constant: 8.Using Excel 2013 - Manipulating Data (VIEW THIS TUTORIAL AS A VIDEO)Ĭalculations can easily be set-up in Excel and it is particularly useful to do this when dealing with repetitive calculations.Therefore, the Clausius-Clapeyron equation for final pressure is: This calculator solves the above equation for P 2. Where R is the ideal gas constant (8.314 J/mol*K) The Clausius-Clapeyron Equation is as follows: However, the pressure can be automatically converted to other pressure units (.e.g., pascals) via the pull-down menu. Pressure (P 2): The calculator returns the vapor pressure at temperature T 2 in atmospheres. ( T 1) Temperature 1 (corresponds with P 1).( ΔH vap) Molar Enthalpy of Vaporization.clausius clapeyron equation calculator Chemistry and Physics for Nurse. INSTRUCTIONS: Choose units and enter the following: Clausius clapeyron equation solver - Apps can be a great way to help. The Clausius-Clapeyron Equation for Pressure calculator estimates the vapor pressure of a liquid at a certain temperature when the vapor pressure at another temperature is known. ![]()
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