Single Unit Material Balances Chemical Reactions Worksheet Page 2
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1
2
3
4
5What happens if reaction occurs ?
What is a species ?
Need to do atom balance !
stoichiometry of the reaction!
Note multiples are also balanced
What is the stoichiometry of the feed?
stoichiometric ratios
Feed Composition of reactants!
When the feed is not stoichiometric !
What is the limiting reactant ?
Fractional excess ! (Nf - Ns)/Ns
Fractional Conversion: N
/N
(same as mass ?)
react
fed
Stoichiometric coefficients:
CH
+ O
+ HCl -> CH
Cl + H
O
4
2
3
2
v
= -1, -1/2, -1, +1, +1 or -2, -1, -2, +2, +2
i
ξ where ξ is the extent of reaction
n
= n
- v
i
i0
i
also works for rates of feed
ξunits of moles
ξ applies to all
because of v , v
i
Useful to bound an expression 0->1
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