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### bar conversion

Posted: Tue Jan 21, 2020 6:24 pm
Could someone more clearly explain how to change the units to bar? Example 5I.1 show it but it is not very clear and I am confused

### Re: bar conversion

Posted: Wed Jan 22, 2020 1:36 am
The conversion of bar to atm will be given in the formula handout we are given in each test. It is mainly a difference in values of R. If you are given values in bar, use the value for R involving bar, and then convert to atm using the formula sheet.

### Re: bar conversion

Posted: Wed Jan 22, 2020 8:21 am
The formula sheet should say how to convert from atm to bar or bar to torr, so you should not worry too much about that.

### Re: bar conversion

Posted: Wed Jan 22, 2020 9:18 am
In example 5I.1, they want you convert the partial pressures PH2 and PCl2 from mPa (which is given) to bar.

Partial pressure of H2 = 4.2 mPa and Cl2 = 8.3 mPa
It's also given that 1 bar = 10^5 Pa
However, we are given partial pressures in mPa. Knowing that there are 1000 mPa in 1 Pa, you can convert 4.2 mPa and 8.3 mPa to 4.2x10^-3 Pa and 8.3x10^-3 Pa.

Now that you know the Pa, you can convert the units to bar.
$\frac{1 bar}{10^5 pa}\cdot 4.2\times 10^-3pa = 4.2\times 10^-8bar$

### Re: bar conversion

Posted: Sun Jan 26, 2020 2:46 pm
I noticed this on the formula sheet thank you for letting me know!

### Re: bar conversion

Posted: Sun Jan 26, 2020 6:46 pm
Also, if you are given the concentration and need to convert into bar, torr, etc., you would use the PV = nRT equation with the corresponding R.