Final answer:
In the Apothecaries' system, 'vii' equals 7 fluid ounces which is 207.0145 mL in the metric system, and 'gr xii' equals 12 grains which is 777.59 mg in the metric system after conversion.
Step-by-step explanation:
The Apothecaries' system is an older form of measurement used in prescribing medicine, and it is different from the metric system currently used worldwide. Converting these measures into the metric system involves understanding the units and using the appropriate conversion factors.
Potassium Triplex 3 vii: In the Apothecaries' system, 'vii' represents 7 fluid ounces. To convert fluid ounces to milliliters (mL), we use the conversion factor 1 fluid ounce = 29.5735 mL. Therefore, 7 fluid ounce would be:
7 fl oz x 29.5735 mL/fl oz = 207.0145 mL
Phenobarbital gr xii: In the Apothecaries' system, 'gr' stands for grains, and 'xii' represents the number 12. To convert grains to milligrams (mg), we use the conversion factor 1 grain = 64.79891 mg. So the conversion for Phenobarbital would be:
12 gr x 64.79891 mg/gr = 777.58692 mg
The Phenobarbital prescription would then be 777.59 mg, when rounded to two decimal places.