## Assistance to find value of Constant a and Constant b

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kevin_leong5510
Newbie
Posts: 2
Joined: Thu Aug 19, 2021 7:36 pm

### Assistance to find value of Constant a and Constant b

Dear admins,

I would like seek your kind assistance to help me find out the value of constant a (bar L2/mol2) and constant b (L/mol
) from Van Der Waals equation { [P + a(n/V)2] (V/n - b) = RT } for the following materials.

1) Propadiene.
2) Methylacetylene

I usually find my answers from the list in this link below:
(You can’t post image, email or url links that are external to this domain. Please remove engineeringtoolbox com)

But both these materials are not listed.

Appreciate all the kind help.
Thank you.

Regards,
Kevin
ChenBeier
Distinguished Member
Posts: 873
Joined: Wed Sep 27, 2017 7:25 am
Location: Berlin, Germany

### Re: Assistance to find value of Constant a and Constant b

Here we go

Propadiene a = 8,23 l^2* bar/ mol^2, b= 0,0747 l/mol
Methylacetylene is Propyne a = 8,4 l^2*bar/mol^2, b= 0,0744 l/mol

https://www.google.com/url?q=https://dr ... p8vKdCcKTC
kevin_leong5510
Newbie
Posts: 2
Joined: Thu Aug 19, 2021 7:36 pm

### Re: Assistance to find value of Constant a and Constant b

Thank you ChenBeier for the link and values given.
Appreciate it.