How to Convert Moles to Pressure

How to Convert Moles to Pressure
••• jakkapan21/iStock/GettyImages

Scientists use the ideal gas law to provide approximate properties of gases. The gas law states that PV = nRT, where P represents the gas’s pressure, V represents its volume, n represents the moles of gas, R represents the ideal gas constant of 0.08206 liter atmospheres per mole per Kelvin and T represents the temperature in Kelvin. Therefore, to convert the moles of gas to pressure, the scientist must know the volume and temperature of the gas, in addition to the number of moles of gas. The pressure is then given by P = nRT / V.

    Convert the volume and temperature to units of liters and Kelvin, respectively, if necessary. Numerous online conversion utilities are available to help you with this task, such as that provided in the Resources section. For example, a volume of 22 cubic feet of gas at 78 degrees Fahrenheit converts to 623 liters at 299 Kelvin.

    Calculate the pressure of the gas, P, in units of atmospheres according to P = nRT / V. For example, if the sample of gas occupying 623 liters at 299 Kelvin represents 55 moles of gas, then P = (55 x 0.08206 x 299)/623 = 2.17 atmospheres.

    Convert the pressure to your preferred units, again by using an online calculator. A pressure of 2.17 atmospheres, for example, converts to 220 kilopascals, 31.9 pounds per square inch or 64.9 inches of mercury.

    Things You'll Need

    • Sample data for a gas, including moles, volume and temperature
    • Calculator

Related Articles

How to Convert SCFM to NM3
How to Convert ATM Pressure to Celsius
How to Find Partial Pressures
How to Convert ATM to Moles of Gas
How to Convert mm Hg to in Hg
How to Calculate the Number of Moles of Collected Hydrogen...
How to Convert the Volume of Co2 Gas to Liquid
How to Calculate the Temperature Drop Due to a Pressure...
How to Convert Kilopascals to Joules
What Happens When the Pressure and Temperature of a...
How to Calculate Liquid Oxygen to Gaseous Oxygen
How to Find the Number of Moles of Co2
Volume Vs. Mass Density
How to Convert mmHg to a kPa
What Is the Density of CO2?
How to Convert Specific Gravity in Weight
How to Convert Vapor Pressure to Concentration
How to Calculate the Pressure of Hydrogen Gas
How to Convert SCFM to NM3
How to Find Relative Barometric Pressure

Dont Go!

We Have More Great Sciencing Articles!