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I see this pretty often, and while i still understand the sentence i'd like to know what it means exactly so that i can use it myself.
The preposition is "as to".
Here's the example: "In summary, a decrease in pressure favours the reaction that causes the number of molecules to increase, whereas an increase in pressure causes the equilibrium to shift in such a way as to reduce the number of molecules."

Now i've looked it up at dictionary.com and it gives me two definitions:
1 - With regard to
2 - According to

But when i replace these definitions in the example above it doesn't make sence.

Can someone help me out with this please?

Thanks in advance, chocolaty.
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This is not the same structure. The preposition takes a noun as object:

As to (= with regard to) my uncle, he is not coming to the wedding.
Please choose a train line as to (= according to) which part of Tokyo you want to visit.

In your example, the 'as' is part of the correlatives 'such...as', here meaning 'a kind which / so as to / in order to':

'An increase in pressure causes the equilibrium to shift in such a way as to reduce the number of molecules.'
'Lance Armstrong cycles at such a speed as to leave all this opponents in the dust.
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to leave all his opponents