MoleBridge
Work stoichiometry one step at a time, and find out which mistake made the number you got.
Learn
The lessons, in the order they build on each other. None of them is locked — if you already know one, skip it; if you jump ahead and it makes no sense, come back.
Moving to another device
Write this down to carry your progress somewhere else:
What this code says
What is not in it
Practise one step
Pick the step you want to work on and answer as many as you like. Nothing is counted, nothing is kept, and you stop when you want to.
Try it
Practice
Nothing here is handed in and nothing is recorded. Ask to see an answer whenever you want it.
Start a session
Both of these came with the work you were set.
Working a problem
What you have so far
Finished
Type this code in wherever you hand your work in. It is the same every time for this session, so you can come back to it.
How it went
What this code says about you
This is the code above, decoded — the same thing whoever marks it sees when they paste it in. Nothing else is in it.