The site supports typesetting chemical formulae and equation using MathJax extension mhchem.
Here are a few examples taken from the mhchem manual site.
Chemical equations:
$\ce{CO2 + C -> 2 CO}$
$\ce{Hg^2+ ->[I^-] HgI2 ->[I^-] [Hg^{II}I4]^2-}$
$C_p[\ce{H2O(l)}] = \pu{75.3 J // mol K}$
$K_\mathrm{a} = 1.74 \times 10^{-5} = \frac{\ce{[H^+][OAc^-]}}{\ce{[HOAc]}}$
$\mathrm{pH} = - \log{\ce{[H^+]}}$
$\ce{A <-> B}$
$\ce{A \leftrightarrows B}$
$\ce{A<=>B}$ $\ce{A <=>> B}$ $\ce{A <<=> B}$
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