Synthesis include mol block

[MJCliffe]

Would be good to have a moles column in the synthesis information section to make stoichiometry clearer. This could connect with molar mass information down the line too.

[ml-evs]

We discussed at some point adding a products section to the synthesis procedure (and I guess we can bake in multistep reactants/products much better with individual steps), but for now you can specify a unit of mol in the synthesis information right? We just don't use anything useful with it... Definitely this is something we should discuss/improve with a few of us (related issue: #442)

[MJCliffe]

I think we want both the mass and the moles: the mass is what we actually measure and the moles are what we impute.

A product box would be nice too: I guess it needs to be clear what goes in it rather than the box.

If there were a box where we can put in chemical formulae and then the moles could be directly calculated.

Some of this depends on the design of this section of course!