## bar conversion

nshahwan 1L
Posts: 100
Joined: Fri Aug 30, 2019 12:18 am

### bar conversion

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

Isha_Maniyar_Dis2E
Posts: 110
Joined: Thu Jul 11, 2019 12:16 am

### Re: bar conversion

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.

Justin Sarquiz 2F
Posts: 106
Joined: Fri Aug 30, 2019 12:15 am

### Re: bar conversion

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.

Julie Park 1G
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

### Re: bar conversion

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.
$\frac{1 bar}{10^5 pa}\cdot 4.2\times 10^-3pa = 4.2\times 10^-8bar$

nshahwan 1L
Posts: 100
Joined: Fri Aug 30, 2019 12:18 am

### Re: bar conversion

I noticed this on the formula sheet thank you for letting me know!

Manav Govil 1B
Posts: 104
Joined: Sat Sep 07, 2019 12:19 am

### Re: bar conversion

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.