When ammonium chloride (\(NH_4Cl\)) reacts with water, the process is endothermic, which means it absorbs heat from the surroundings. As a result, the surrounding water gets colder.
So, the correct answers would be:
- The surrounding water is B. colder.
The temperature change can vary, but in many contexts, it can be reported as around 6.67 degrees Celsius when referring specifically to certain concentrations or conditions.
Thus, if using both parameters:
- The surrounding water gets B. colder by C. 6.67 degrees Celsius.