trial Chem latex

\(\ce{2H + O -> H2O}\) $$\ce{H2SO4}$$

$$ \chemfig{C-[:30]C-[:-30]C-[:30]C-[:-30]C} $$

$$ \ce{Na2SO4} $$ $$\ce{SO4^2-}$$

$$\ce{A <–> B} $$

$$\A <–> B$$