Atomic Species Balances

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This could be better explained. It is because they are both produced in equal amounts by reaction 2 (1:1 stoichiometric ratio). Since neither are involved in a further reaction, you know that they have to be the same, because when one C3H6 is made, a CH4 is also made.

You cannot say this about C2H4 and H2 because C2H4 reacts further in rxn2, where H2 does not react again.

simondsb

Shouldn't have skipped the part where you actually find the number of moles of each molecule, now I'm still confused as to how you got the 50 moles, 10 moles, and 60 moles

mpolokengmalatji

It can be solved by extent of reaction, only that you get 6 simultaneous equations to solve instead of the 4 obtained using atomic species balances.

tautvydasvilius

How do you get that nC2H4=50 and N3H6=10, NH2= 60?

JuanPabloChvz

This screencast has been reviewed by faculty from other academic institutions.

LearnChemE

What is that molar molar nc3h6=nch4 about? My book literally said nothing about that.

Architrex

how do you get the number of moles for CH4, C2H4. C3H6, CH4 and H2 ??

monkim

thank you very much...your work is brilliant

muhammadharis

How is the number of moles of H2 anything but 70?

We know the extent of rxn is 0.70, i.e., 70 mol of ethane react to form 70 mol of ethylene and 70 mol of H2. Ethylene goes on to react with unreacted ethane, so the final quantity of ethylene is less than 70 moles. The H2 does NOT react, however, so I am unsure why it should be 60.

P.S. The math shown makes sense to me, I just conceptually do not understand why nH2 = -nC2H6.

Napoleonlikespie

How did you get H2=? I mean it’s missing we need it to find the others

d.j

on minute 3.43, you said ethane ? CH4 <----methane

jinmelaka

how can you not explain how to solve the equations?

pete

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