How to calculate ppm from percent
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The concentration expressed in decimal form is unit-less. (for temperature 21.1☌ (70☏) and pressure 1 atm)Ĭonversion of grams per liter to ppm (mole basis) for gas mixture: For example, if Compound A is hydrogen sulfide, with a molecular weight of 34.08 gram/mole, we obtain the following concentration:Ġ.000004 moles per liter x 34.08 gram per mole =Ġ.000140 gram per liter or 0.140 milligram per liter General formula for conversion of ppm (mole) to grams per liter for gas mixtures In order to find the weight of Compound A, we need to know its molecular weight. The concentration of 100 ppm (parts per million) is unit-less, and equals 100 mole-parts per 1,000,000 total moles = 0.000100 in decimal form thus the amount of moles of Compound A in one liter of mixture is: (total # moles per liter) x (concentration of Compound A). Since the concentration of Compound A is 100 ppm, the total number of moles of Compound A in 1 liter is: One liter of gas will then contain (1/24.15 ) moles. Using the Ideal Gas Law (PV = nRT) for a temperature of 294.1°K (21.1☌), a pressure of 1 atm, and the gas constant R of 0.0821 liter x atm/mole x degree K, we find that 1 mole of ideal gas occupies 24.15 liters. At around atmospheric pressure, gases behave in close to ideal manner.
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Pressure of sample is assumed to be 1 atm just before injection.Temperature of sample is assumed to be at 21.1☌ (70☏).