Final answer:
The amount of substance for a field drug test kit is not specified, but the calculation for a Breathalyzer reaction requires 0.18 mg or 1.8 × 10^-4 grams of ethanol to signify a potentially fatal blood alcohol level of 0.7%.
Step-by-step explanation:
The query related to the loading amount in a field drug test kit is not directly answered in the provided references.
However, when addressing the calculation of the mass of ethanol that must be present in a person's breath for a complete reaction in a Breathalyzer test, we use the given volume and concentration of one reactant to determine the necessary mass of the other reactant. In this particular case, the mass required is 0.18 mg or 1.8 × 10-4 grams of ethanol (C2H5OH). This value is associated with a blood alcohol level of 0.7%, which is considered to be potentially fatal.This information is crucial in understanding the implications of blood alcohol levels, with a concentration of 0.7% considered potentially fatal. Such quantitative assessments contribute to the forensic analysis of intoxication levels in various settings.