91 -- How many of the following statements are correct?
Reaction rate is a useful concept for understanding the rate of reaction progress per unit time.
The average rate of formation of a product equals its stoichiometric coefficient multiplied by 1.
The slope of the ``mole–time'' graph for each participant in a reaction is proportional to its stoichiometric coefficient.
Reaction rate is obtained by dividing the average rate of consumption or production of each substance in the reaction by its stoichiometric coefficient.
(1) $4$ (2) $3$ (3) $2$ (4) $1$
\textbf{91 --} How many of the following statements are correct?
\begin{itemize}
\item Reaction rate is a useful concept for understanding the rate of reaction progress per unit time.
\item The average rate of formation of a product equals its stoichiometric coefficient multiplied by 1.
\item The slope of the ``mole–time'' graph for each participant in a reaction is proportional to its stoichiometric coefficient.
\item Reaction rate is obtained by dividing the average rate of consumption or production of each substance in the reaction by its stoichiometric coefficient.
\end{itemize}
\begin{center}
(1) $4$ \qquad (2) $3$ \qquad (3) $2$ \qquad (4) $1$
\end{center}