Reactive Material Balance: Screencasts
We suggest that after watching each screencast, you list the important points as a way to increase retention.
Screencast 1:
Reviews stoichiometry, balancing reactions, and limiting reactants.
Screencast 2:
Screencast 3:
Performs a molecular species balance for a single reactor.
Screencast 4: (optional)
Important Equations:
\[\xi = \frac{n_i – n_{i,in}}{v_i}\]
where \(n_i\) is the number of moles leaving the system (or the number of moles at a given time in a closed system),
\(\xi \) is the extent of reaction dimensionless, and
\(v_i\) is the stoichiometric coefficient (mol) (positive for products, negative for reactants).
Note that many textbooks use the notation where \(v_i\) is dimensionless and ξ has units of moles.
\[f = \frac{n_{i,in} – n_i}{n_{i,in}}\]
where \(f\) is fractional conversion.
Balance on atomic species: input = output
Balance on reactants: input = output + consumption
Balance on products: input +generation = output
degrees of freedom (molecular species balance) = # unknowns +# independent reactions – #independent molecular species balances – # equations relating unknown variables
degrees of freedom (atomic species balance) = # unknowns +# independent atomic species – #independent molecular species balances for nonreactive species – # equations relating unknown variables.