For this case we have to take into account the following conversion:
1 lb = 453.59 g
The weight of the cat in grams is:
(12) * (453.59) = 5443.08 grams
The weight of the cat in kilograms is:
(5443.08) * (1/1000) = 5.44308 Kg
Then, we calculate the number of milligrams needed:
amoxicillin at 5 mg / kg twice a day for seven days:
(2) * (7) * (5) = 70 (mg / (kg * day))
The number of milligrams per day is:
5.44308 * (70) = 381.0156 mg / day
Finally the number of mLs is:
(381.0156) / (50) = 7.62 mLs / day
Answer:
the cat will need 7.62 mLs per day