Hi folks,

I try to write
\chemical{Na + H_2O → NaOH + 1/2 H_2}
and it works. But I do not like 1/2 that way.

But if I want to use
\chemical{Na + H_2O → NaOH + \frac{1}{2} H_2}    %\frac or variants of it
it doesn't work.

\chemical{Na + H_2O → NaOh +}\frac{1}{2}\chemical{H_2}
doesn't work too.

\startformula
\chemical{Na + H_2O → NaOH +}\xxfrac{1}{2}\chemical{H_2} % and some other variants of \frac
\stopformula
does work, but the distance between + and the \frac-expression is to large.

Any hints?

Greetings
Tomás
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