2
\begin{align} 
& nH_{2}O + ^* \rightarrow H_{2}O^*_{n} 
& mH_{2}O + ^* \rightarrow H_{2}O^*_{m-1} + H_{2}O
\end{align}

The above works but I want to get rid of the italicized equation. So I did the following

\begin{align} 
\mathrm{
& nH_{2}O + ^* \rightarrow H_{2}O^*_{n} 
& mH_{2}O + ^* \rightarrow H_{2}O^*_{m-1} + H_{2}O 
}
\end{align}

It gives me the "Missing } inserted" error :(

  • You should have a look at the chemformula package. – egreg Oct 9 '15 at 21:48
  • thanks for letting me know about the existence of such package! – gogo Oct 11 '15 at 21:39
1

You need another \mathrm:

\begin{align} 
& \mathrm{nH_{2}O + ^* \rightarrow H_{2}O^*_{n} 
}
&\mathrm{ mH_{2}O + ^* \rightarrow H_{2}O^*_{m-1} + H_{2}O 
}
\end{align}

Everything should be closed before & (or \\ etc.) next to the opening {.

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