# Mathrm within align block doesn't work?

\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

You need another \mathrm:
\begin{align}

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