mhchem

This file contains all the examples in the mhchem manual.
Ref: https://mhchem.github.io/MathJax-mhchem/

Chemical Equations (ce)

Source	Temml
`\ce{CO2 + C -> 2 CO}`	$CO_{2} + C \overset{}{\to} 2 CO$
`\ce{Hg^2+ ->[I-] HgI2 ->[I-] [Hg^{II}I4]^2-}`	$Hg^{2 +} \overset{\overset{}{I^{-}}}{\to} HgI_{2} \overset{\overset{}{I^{-}}}{\to} [Hg^{II} I_{4}]^{2 -}$
`C_p[\ce{H2O(l)}] = \pu{75.3 J // mol K}`	$C_{p} [H_{2} O (l)] = 75.3 \frac{J}{mol K}$

Chemical Formulae

Source	Temml
`\ce{H2O}`	$H_{2} O$
`\ce{Sb2O3}`	$Sb_{2} O_{3}$

Charges

Source	Temml
`\ce{H+}`	$H^{+}$
`\ce{CrO4^2-}`	$CrO_{4}^{2 -}$
`\ce{[AgCl2]-}`	$[AgCl_{2}]^{-}$
`\ce{Y^99+}`	$Y^{99 +}$
`\ce{Y^{99+}}`	$Y^{99 +}$

Stoichiometric Numbers

Source	Temml
`\ce{2 H2O}`	$2 H_{2} O$
`\ce{2H2O}`	$2 H_{2} O$
`\ce{0.5 H2O}`	$0.5 H_{2} O$
`\ce{1/2 H2O}`	$\frac{1}{2} H_{2} O$
`\ce{(1/2) H2O}`	$(1 / 2) H_{2} O$
`\ce{$n$ H2O}`	$n H_{2} O$

Isotopes

`\ce{^{227}_{90}Th+}`	$_{}^{}_{90}^{227} Th^{+}$
`\ce{^227_90Th+}`	$_{}^{}_{90}^{227} Th^{+}$
`\ce{^{0}_{-1}n^{-}}`	$_{}^{}_{- 1}^{0} n^{-}$
`\ce{^0_-1n-}`	$_{}^{}_{- 1}^{0} n^{-}$
`\ce{H{}^3HO}`	$H_{}^{}_{}^{3} HO$
`\ce{H^3HO}`	$H_{}^{}_{}^{3} HO$

Reaction Arrows

Source	Temml
`\ce{A -> B}`	$A \overset{}{\to} B$
`\ce{A <- B}`	$A \overset{}{\leftarrow} B$
`\ce{A <-> B}`	$A \overset{}{\leftrightarrow} B$
`\ce{A <--> B}`	$A \overset{}{\to} \overset{\overset{}{}}{\leftarrow} B$
`\ce{A <=> B}`	$A \overset{}{⇀} \overset{\overset{}{}}{↽} B$
`\ce{A <=>> B}`	$A \overset{}{⇀} \overset{\overset{}{}}{↽} B$
`\ce{A <<=> B}`	$A \overset{\overset{}{}}{↽} \overset{}{⇀} B$
`\ce{A ->[H2O] B}`	$A \overset{\overset{}{H_{2} O}}{\to} B$
`\ce{A ->[{text above}][{text below}] B}`	$A \to_{\underset{}{text below}}^{\overset{}{text above}} B$
`\ce{A ->[$x$][$x_i$] B}`	$A \to_{\underset{}{x_{i}}}^{\overset{}{x}} B$

Parentheses, Brackets, Braces

Source	Temml
`\ce{(NH4)2S}`	$(NH_{4})_{2} S$
`\ce{[\{(X2)3\}2]^3+}`	$[{(X_{2})_{3}}_{2}]^{3 +}$
`\ce{CH4 + 2 $\left( \ce{O2 + 79/21 N2} \right)$}`	$CH_{4} + 2 (O_{2} + \frac{79}{21} N_{2})$

States of Aggregation

Source	Temml
`\ce{H2(aq)}`	$H_{2} (aq)$
`\ce{CO3^2-_{(aq)}}`	$CO_{3}^{2 -}_{(aq)}$
`\ce{NaOH(aq,$\infty$)}`	$NaOH (aq, \infty)$

Crystal Systems

Source	Temml
`\ce{ZnS($c$)}`	$ZnS (c)$
`\ce{ZnS(\ca$c$)}`	$ZnS (\sim c)$

Variables

Source	Temml
`\ce{NO_x}`	$NO_{x}$
`\ce{Fe^n+}`	$Fe^{n +}$
\ce{x Na(NH4)HPO4 ->[\Delta] (NaPO3)_x + x NH3 ^ + x H2O}	$x Na (NH_{4}) HPO_{4} \overset{\overset{}{Δ}}{\to} (NaPO_{3})_{x} + x NH_{3} ↑ + x H_{2} O$

Greek Characters

Source	Temml
`\ce{\mu-Cl}`	$μ - Cl$
`\ce{[Pt(\eta^2-C2H4)Cl3]-}`	$[Pt (η^{2} - C_{2} H_{4}) Cl_{3}]^{-}$
`\ce{\beta +}`	$β^{+}$
`\ce{^40_18Ar + \gamma{} + \nu_e}`	$_{}^{}_{18}^{40} Ar + γ + ν_{e}$

(Italic) Math

Source	Temml
`\ce{NaOH(aq,$\infty$)}`	$NaOH (aq, \infty)$
`\ce{Fe(CN)_{$\frac{6}{2}$}}`	$Fe (CN)_{\frac{6}{2}}$
`\ce{X_{$i$}^{$x$}}`	$X_{i}^{x}$
`\ce{X_$i$^$x$}`	$X_{i}^{x}$

Italic Text

Source	Temml
`\ce{$cis${-}[PtCl2(NH3)2]}`	$c i s - [PtCl_{2} (NH_{3})_{2}]$
`\ce{CuS($hP12$)}`	$CuS (h P 12)$

Upright Text, Escape Parsing

Source	Temml
`\ce{{Gluconic Acid} + H2O2}`	$Gluconic Acid + H_{2} O_{2}$
`\ce{X_{{red}}}`	$X_{red}$
`\ce{{(+)}_589{-}[Co(en)3]Cl3}`	$(+)_{589} - [Co (en)_{3}] Cl_{3}$

Bonds

Source	Temml
`\ce{C6H5-CHO}`	$C_{6} H_{5} - CHO$
`\ce{A-B=C#D}`	$A - B = C \equiv D$
`\ce{A\bond{-}B\bond{=}C\bond{#}D}`	$A - B = C \equiv D$
`\ce{A\bond{1}B\bond{2}C\bond{3}D}`	$A - B = C \equiv D$
`\ce{A\bond{~}B\bond{~-}C}`	$A B C$
`\ce{A\bond{~--}B\bond{~=}C\bond{-~-}D}`	$A B C D$
`\ce{A\bond{...}B\bond{....}C}`	$A \cdot \cdot \cdot B \cdot \cdot \cdot \cdot C$
`\ce{A\bond{->}B\bond{<-}C}`	$A \to B \leftarrow C$

Addition Compounds

Source	Temml
`\ce{KCr(SO4)2*12H2O}`	$KCr (SO_{4})_{2} \cdot 12 H_{2} O$
`\ce{KCr(SO4)2.12H2O}`	$KCr (SO_{4})_{2} \cdot 12 H_{2} O$
`\ce{KCr(SO4)2 * 12 H2O}`	$KCr (SO_{4})_{2} \cdot 12 H_{2} O$

Oxidation States

Source	Temml
`\ce{Fe^{II}Fe^{III}2O4}`	$Fe^{II} Fe^{III}_{2} O_{4}$

Unpaired Electrons, Radical Dots

Source	Temml
`\ce{OCO^{.-}}`	$OCO^{• -}$
`\ce{NO^{(2.)-}}`	$NO^{(2 •) -}$

Kröger-Vink Notation

Source	Temml
`\ce{Li^x_{Li,1-2x}Mg^._{Li,x}` `$V$'_{Li,x}Cl^x_{Cl}}`	$Li_{Li, 1 - 2 x}^{\times} Mg_{Li, x}^{•} V_{Li, x}^{'} Cl_{Cl}^{\times}$
`\ce{O''_{i,x}}`	$O_{i, x}^{''}$
`\ce{M^{..}_i}`	$M_{i}^{• •}$
`\ce{$V$^{4'}_{Ti}}`	$V_{Ti}^{4'}$
`\ce{V_{V,1}C_{C,0.8}$V$_{C,0.2}}`	$V_{V, 1} C_{C, 0.8} V_{C, 0.2}$

Equation Operators

Source	Temml
`\ce{A + B}`	$A + B$
`\ce{A - B}`	$A - B$
`\ce{A = B}`	$A = B$
`\ce{A \pm B}`	$A \pm B$

Precipitate and Gas

Source	Temml
`\ce{SO4^2- + Ba^2+ -> BaSO4 v}`	$SO_{4}^{2 -} + Ba^{2 +} \overset{}{\to} BaSO_{4} ↓$
`\ce{A v B (v) -> B ^ B (^)}`	$A ↓ B ↓ \overset{}{\to} B ↑ B ↑$

Other Symbols and Shortcuts

Source	Temml
`\ce{NO^*}`	$NO^{*}$
`\ce{1s^2-N}`	$1 s^{2} - N$
`\ce{n-Pr}`	$n - \Pr$
`\ce{iPr}`	$iPr$
`\ce{\ca Fe}`	$\sim Fe$
`\ce{A, B, C; F}`	$A, B, C; F$
`\ce{{and others}}`	$and others$

Complex Examples

Source	Temml
`\ce{Zn^2+ <=>[+ 2OH-][+ 2H+]` `$\underset{\text{amphoteres Hydroxid}}` `{\ce{Zn(OH)2 v}}$ <=>[+ 2OH-][+ 2H+]` `$\underset{\text{Hydroxozikat}}` `{\ce{[Zn(OH)4]^2-}}$}`	$Zn^{2 +} ⇀_{\underset{}{}}^{\overset{}{+ 2 OH^{-}}} ↽_{\underset{}{+ 2 H^{+}}}^{\overset{}{}} \underset{amphoteres Hydroxid}{Zn (OH)_{2} ↓} ⇀_{\underset{}{}}^{\overset{}{+ 2 OH^{-}}} ↽_{\underset{}{+ 2 H^{+}}}^{\overset{}{}} \underset{Hydroxozikat}{[Zn (OH)_{4}]^{2 -}}$
`\ce{$K = \frac{[\ce{Hg^2+}][\ce{Hg}]}` `{[\ce{Hg2^2+}]}$}`	$K = \frac{[Hg^{2 +}] [Hg]}{[Hg_{2}^{2 +}]}$
`\ce{$K =` `\ce{\frac{[Hg^2+][Hg]}{[Hg2^2+]}}$}`	$K = \frac{[Hg^{2 +}] [Hg]}{[Hg_{2}^{2 +}]}$
`\ce{Hg^2+ ->[I-]` $\underset{\mathrm{red}}{\ce{HgI2}}$ `->[I-] $\underset{\mathrm{red}}` `{\ce{[Hg^{II}I4]^2-}}$}`	$Hg^{2 +} \overset{\overset{}{I^{-}}}{\to} \underset{red}{HgI_{2}} \overset{\overset{}{I^{-}}}{\to} \underset{red}{[Hg^{II} I_{4}]^{2 -}}$

Physical Units

Source	Temml
`\pu{123 kJ}`	$123 kJ$
`\pu{123 mm2}`	$123 m m^{2}$
`\pu{123 J s}`	$123 J s$
`\pu{123 J*s}`	$123 J \cdot s$
`\pu{123 kJ/mol}`	$123 kJ / mol$
`\pu{123 kJ//mol}`	$123 \frac{kJ}{mol}$
`\pu{123 kJ mol-1}`	$123 kJ m o l^{- 1}$
`\pu{123 kJ*mol-1}`	$123 kJ \cdot m o l^{- 1}$
`\pu{1.2e3 kJ}`	$1.2 \cdot 10^{3} kJ$
`\pu{1,2e3 kJ}`	$1, 2 \cdot 10^{3} kJ$
`\pu{1.2E3 kJ}`	$1.2 \times 10^{3} kJ$
`\pu{1,2E3 kJ}`	$1, 2 \times 10^{3} kJ$