In chemical equations, various symbols are used to convey specific conditions under which reactions proceed. The question is asking about the symbol that indicates the pressure at which a chemical reaction occurs.
Let's look at the options provided:
1. [tex]\(\xrightarrow{25^{\circ} C }\)[/tex] — This symbol is used to indicate the temperature at which the reaction takes place (25 degrees Celsius) but says nothing about the pressure.
2. [tex]\(\xrightarrow{\Delta}\)[/tex] — This symbol is used to indicate that the reaction requires heat (in other words, the reaction is heated) but does not specify any details about pressure.
3. [tex]\(\xrightarrow{2 atm }\)[/tex] — This symbol specifically indicates that the reaction occurs at a pressure of 2 atmospheres. Therefore, this symbol is used to specify the pressure condition for the reaction.
4. [tex]\(\xrightarrow{ Pt }\)[/tex] — This symbol indicates the presence of a platinum catalyst but does not provide information about the pressure conditions of the reaction.
Based on these clarifications:
The correct symbol to indicate the pressure at which a chemical reaction occurs is [tex]\(\xrightarrow{2 atm }\)[/tex].
