... but this time it is in a building of the chemistry department ...

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In this building there is way more space. Therefore some of the lecture halls here are also used for Maths lectures or for the exams in Maths. No wonder, the chemists need more than just a blackboard, chalk and paper for research. And they have more students at their department, too ...

 

Now go to

the Great Lecture Hall A22/B.001.

To get there, you'll take the entrance in front of you which leads you to Fabeckstr. You should now see the huge grey building of inorganic chemistry and next to it a small one with "ZEDAT" on it across the street. Cross the street and take the path between those buildings. You should now see that there is another long building with an entrance to your left. Enter this building through the door which is on your left side if you stand in front of it. This is A22. Follow the floor until you get to an open working area, the Lecture Hall is right across from it.