Consultation on modifying the stoichiometric coefficients

Hello. The following is the reaction that occurs in the reactor. If I want to automatically adjust the stoichiometric coefficients (mass basis) of the products Xylose, arabinose, and mannose in the sensitivity analysis while keeping the conversion efficiency 0.6 unchanged, could I consult you what methods or functions can be adopted or invoked? Thanks for your help.

```
class ReactorSystem(bst.units.design_tools.PressureVessel, Unit):
def __init__()
_N_ins = 2
_N_outs = 1
_graphics = bst.Flash._graphics
_units = {'Residence time': 'hr',
'Reactor volume': 'm3'}
self.reactions = Rxn(Hemicellulose + 0.2substance → 0.2Xylose + 0.2arabinose + 0.1mannose + 0.3galactose + CO2 , ‘Hemicellulose’, 0.6, basis = ‘wt’)
```

Start with the ReactorSystem definition and its self.reactions Rxn declaration, then trace how sensitivity analysis is configured in the repository. Determine whether the product stoichiometric coefficients can be varied on a mass basis while keeping conversion efficiency at 0.6; done means identifying a supported method or function and demonstrating its use.

Written by the indexing model from the issue text.