[Unit conversion] How to convert benzene concentration to ppm
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This post was last edited by *nht1 on 2016-4-21 22:24. The concentration of pure benzene is 10 mg/m3; how can this be converted to ppm? I would like to ask for advice~~~
10 mg/m3 divided by the molecular weight of benzene, multiplied by the molar volume of an ideal gas of 22.4, gives the volume ppm.
10/78*22.4=2.87ppm.
PPM stands for one part per million. The unit corresponding to m3 is Kg; therefore, 1 mg represents one part per million, and 10 mg/m3 is equivalent to 10 ppm
PPM is a volume unit; therefore, it is necessary to convert the mass in mg to volume in mL. This is done by dividing the molecular weight of benzene to obtain the amount in mmol, and then multiplying that value by 22.4 mL/mmol. The result is 2.872 mL/m3, which is equivalent to ppm
(10mg/m3)/78 (no units)*22.4L/mol – how can one obtain the ppm unit? Please explain in detail. I don’t understand ? ?
PPM has no unit; it simply means “one part per million by volume”, either ppm(v) or mass ppm. The premise is that no units are used; instead, the same unit, whether mass or volume, is used for division.
I’ve learned that ppm is a ratio; it’s the molecular weight divided by 22.4
The concentration of pure benzene is 10 mg/m3; it’s not clear whether this refers to a concentration in a gas or in a liquid, as the conversion methods differ. For gases, using the conversion method from floor 3, 1 m3 can be approximated as 1 Nm3; if there is a significant difference, the temperature and pressure need to be adjusted. By calculating the mass of 1 m3 of liquid, it is possible to determine the ppm value.
PPM means one part per million. The unit corresponding to m3 is Kg; therefore, 1 mg is one part per million, and 10 mg/m3 is 10 ppm. This is the correct answer! ! ! As for 22.4, it is the molar volume of an ideal gas! How can it be used in a solution? 22.4 can correct real gases and convert them into ideal gases.